I'm sure, like all aspects, it can have some negative qualites, as well, depnding on the placements and other aspects to the conjunction. The one that seems most glaringly apparent to me is the possiblity of over-doing whatever the aspects represents. The Jupiter would expand the natural drive of the Mars. For example, Mars conjunct Jupiter in Aries could show a successful entrepeneur or a person with an excessive uncontrollable temper and warlike tendency.Energy and enthusiasm combine to produce ambition, wealth and luck. You are liberal, self-confident and good at making decisions. Open, frank and generous, you tend to accumulate material possessions. This aspect often indicates a love of sports and the possibility of gain through a military career. Your restlessness and fearlessness enable you to take on any and all adversaries. It is easy for you to propel yourself into the limelight. If you drive yourself too hard, your biggest problem may be physical exhaustion.
With the conjunction of Mars and Jupiter, you have an abundance of energy and enthusiasm to take on tasks that would frighten all but the most courageous. In order to get what you want, you assert yourself fearlessly, even in the face of danger. You have a rather reckless faith in your ability to tempt fate and take chances, never doubting that you will succeed. What you lack in finesse you make up for in arrogance. You rise to a challenge at the slightest provocation, and your competitors have cause for alarm when you oppose them. You enjoy direct confrontation with your adversaries, and you revel in the accompanying glory and publicity. Fascinated by the entries found in the Guinness Book of Records, you would be pleased to find your name listed under some accomplishment there.
With your flair for the dramatic, you don't do anything in moderation. Not content to simply win over a competitor, you punctuate the victory with some kind of ritualistic, publicity-seeking display. You know how to achieve recognition by drawing the public's attention to your talents.
There are many ways you can use this very forceful, dynamic aspects. You have an exciting combination of physical stamina and intellectual resources. Because you don't believe in failure, your chances for success are improved. If you express your creative abilities physically, you will apply your intellecutal skill and common sense to obtain the best results from your efforts. Should you follow a more intellectually demanding life pursuit, it will be characterized by an incredible degree of physical endurance and competitiveness. Such fields as sports, exploration, law, government, acting, composing, or writing would provide you with vast opportunities to display your talents and demonstrate what you can do.
Your most persistent liability is your lack of moderation, which can cause physical exhasution. Your driving ambition to rise above the challenges you set your yourself can cause deterioration of your physical resources. It is essential that you take periodic rest or vacations from the constant abrasion of close competition.
Harmonious Mars/Jupiter aspects are a marker of worldly comfort and financial success. The conjunction indicates a person who is energetic, resourceful, frank, outspoken, pioneering, and adventurous. There is often executive ability and an entrepreneurial attitude toward business ventures. You stand up for your beliefs and would be a formidable opponent in any kind of battle or competition. The energy of Mars combines with the expansiveness of Jupiter to increase your enthusiasm, liveliness, and optimism. You probably enjoy travel, flying, the outdoors, competitive sports, vigorous exercise, and other Jupiter-ruled pursuits. Often there is an interest in philosophical, legal, religious, scientific, or political matters.
You enjoy learning about something and then spreading the word to others. This can lead to success in broadcasting, teaching, the travel industry, promoting, propaganda, publicity, advertising, or Internet related businesses. You like to display your talent before others. There may also be talent for Mars-ruled occupations that require courage, energy and risk-taking (e.g., police, military, etc.), or that involve the use of fire, explosives, weapons, or instruments that penetrate the body (e.g., surgery, acupuncture, etc.). If this conjunction forms stressful aspects, there may be problems with impulsive or addictive behavior. -- Interpretation from our Career report.
Alternate, short interpretations: *You have a positive, "can-do" attitude and tackle life's challenges with relish. You are self-confident and have a strong will to succeed, to see how much you can do and how far you can go. No matter what you accomplish, you do not rest on your laurels. You want to keep on going, to do even bigger things. You are forward-looking, enterprising, and enthusiastic about new projects. You are not happy in situations that do not offer you challenges and the potential for growth and expansion in the future - no matter how secure or satisfactory they may be in other respects. You enjoy competition, but you compete mostly with yourself, to see how much of your vision and potential you can really achieve. You make a good leader, inspiring courage and confidence in others. You usually enjoy good health and high vitality.
#You find that most beginnings and endings in your life are fortunate, and you are able to extract the spiritual lessons successfully. Occasionally you rebel and run away from a lesson that could have been very informative.
Mars square Jupiter
This is a difficult aspect in any chart, although it does have its brighter side. Although you are impatient, scattered and prone to domestic and professional squabbles, you are also energetic, ready and able to meet the challenges you encounter.
Although you have the energy and guts to tackle the obstacles life hands you, you must cultivate self-discipline if you are going to succeed in your endeavors. Otherwise you will "spread yourself too thin" and scatter your energies wastefully. Although you admire others who are successful, you must be willing to put out the sustained effort required to achieve your goals.
Your greatest impediment to success is your impatience. If a project doesn't "pan out" right away, you drop it and go on to something else which offers more immediate results. This aspect will improve as you age, and you will eventually learn to have faith in yourself--which in turn will help you cultivate persistence and self-discipline.
Learn to set priorities and stick to them. And channel all of your energies into one major project rather than scattering your efforts to the four corners of the earth. You should carefully husband your resources, especially your own time and energy, and plan your actions more carefully.
In a career you could excel in law, government, acting, media, public speaking, writing, teaching or even sports. Don't be discouraged by the setbacks you encounter on your road to success. You will eventually see that you can learn more from your failures than your successes. Get up, brush yourself off, and keep on going.
In your intimate relationships you will probably encounter much tension and adversity. You may sometimes find it difficult to deal closely with others and may even encounter problems with co-workers or employers. This is partly because you can't take criticism gracefully, and you are prone to complaining about your misfortunes.
Traditionally, this aspect indicates that you are accident prone. In truth, you are likely to disregard safety practices and therefore set yourself up for injury. Try not to be so impulsive. Also, be careful not to overindulge in anything (work or play). Get lots of rest and watch your health. -- Interpretation from Your Personal Path report.
Mars/Jupiter contacts are the sign of the enthusiast if not
the fanatic. There is little more one need say, except to point
out that the enthusiasm is usually for some Jovian object such
as travel, religion, or the stage.
And it seems a rather prosperous factor, those having it
either being well off, or at least well connected, though of
course some poor people must be born when it is operative.
The major afflictions between these two are certainly very
dangerous, Excess appears in many forms. The native who has
this temptation indicated in his chart should study and pursue
the virtues of "The Middle Way."