If Sun sextile Jupiter sits in your natal chart, you carry a quiet but very steady source of faith in yourself. Not the loud fanfare of 'I'm the best', which the Sun-Jupiter conjunction or their square is more likely to give, but a calm, even feeling: I'm all right, the world is broadly well disposed towards me, I have a right to take up my place. That basic sense usually forms early, in childhood, when the child feels that adults treat them kindly and that love doesn't have to be won through grand deeds.
The Sun in a chart governs who you take yourself to be — your will, the way you present yourself to the world. Jupiter adds scale, faith, a leaning towards growth, a wish to push past the familiar. In a sextile these two functions pull gently in the same direction. You want something for yourself, and at the same time a voice inside whispers that you could ask for more than you currently do. The voice doesn't sound like ambition and it doesn't sound like pressure; it sounds like a quiet offer. Take it up and you have it, leave it and nobody insists.
From the outside this configuration often looks like easy luck. People around you assume things come to you without effort: the job turned up fast, the right person crossed your path at the right time, the offer landed in your lap. In truth the work goes on the whole while, it's just internal. You give off a basic calm and openness, and people instinctively meet you halfway. The teacher more often gives you the chance to retake the exam. The boss more often hears your idea out. The stranger in the next aeroplane seat more often turns out to be the person who, a year on, invites you into their project.
But that same ease is the aspect's chief trap. When the world answers you with 'yes' on the whole, it becomes easy to stop taking steps. Why strain, if things fall into place anyway. And then at some point a person discovers that they're forty, and the large life they felt ready for at twenty has stayed on the drawing board. There was no crisis, no catastrophe, nothing that forced a change of course. The sextile simply stays quiet when nobody is listening for it.
In my work with charts like these I almost always ask one question. Where in your life does growth live right now? Not 'what good things do you have', but where, specifically, do you learn something new each week, step past the familiar, study, widen your circle. If there's no such point, the aspect drifts into hibernation. A characteristic soft boredom appears, the kind a person can't quite name. Nothing hurts, exactly, yet life tastes flat. That is the voice of Jupiter left without a task.
Professionally a chart like this unfolds well wherever the theme of a widening horizon is in play. Teaching, especially adults. Law and consulting, especially the international or the complex. Publishing, educational products, lecturing. Work with foreigners and projects abroad. Religious and philosophical themes, for those lucky enough to grow up in a setting where such work is possible. What ties these fields together is one thing: you're paid for helping others see the world more broadly than they did before meeting you.
There are also some characteristically quiet difficulties. The first is over-reading your own strength. Jupiter loves a big swing, and the sextile with the Sun adds the confidence that you'll cope. In practice a person's resources are finite while the number of started projects keeps rising. The remedy is simple and hard at once: learning to say 'no' to interesting offers, especially the ones in which you can see real promise. The promise is genuine; the time for it isn't there.
The second difficulty is physical relaxation. Jupiter is tied to the theme of excess, and in a harmonious contact with the Sun the body has a leaning towards extra weight, towards tiredness after rich food, towards a soft way of living. It's no sentence, but in later life it's worth watching that good cheer and a love of life don't turn, week by week, into a slightly larger portion of you. Frame it as a gentle habit to keep an eye on, not a fate to fear.
The third difficulty is a soft dishonesty with yourself. When life falls into place, it becomes easy to lose track of what in it is genuinely yours and what simply arrived by inertia. Every few years it helps to take a quiet inventory: what did I choose, and what chose me, with my agreeing because it was convenient. Without that review a Sun–Jupiter chart can drift, unnoticed, into a very comfortable life that isn't quite your own.
The full picture, naturally, depends on the signs, the houses and the other aspects to this pair. To see exactly how your Sun sextile Jupiter plays out, the whole chart has to be read together — and what's written here is best taken as a starting point for reflection rather than a finished portrait.