If Sun sextile Pluto sits in your natal chart, the odds are you won't spot the link straight away. It doesn't sound loud, it doesn't dictate your character, and it doesn't force you to live your life through a string of crises. The sextile is a quiet aspect by nature. It offers rather than demands. And with the Sun and Pluto, the offer runs something like this: you can lean calmly on your own depth at the very point where your surface supports stop holding.
Those surface supports look much the same for all of us. A familiar face, a familiar circle, a familiar way of earning, a familiar role in the family. They work right up until the first serious rupture — a redundancy, a divorce, the loss of someone close, a crisis of meaning. For most people those moments trigger panic, and it takes months, sometimes years, to put themselves back together. With this aspect in the chart, something else switches on instead. Not instantly, not automatically, but with a minimum of attention to yourself it does switch on: a steady inner voice that says, calmly, "Right — that's one chapter ending. We'll work this out." An access to reserves you had no idea were there. The ability to remake yourself without the wrench.
The second quality the Sun and Pluto bring through a sextile has to do with a feel for hidden motives. You tend to see what people actually want, and you usually see it without malice. This isn't the suspicion of the Plutonic square or the wariness of the opposition. It's calm observation. You can tell when you're being lied to. You can tell when someone is trying to use you. You can tell when a person says one thing while their feet move in the opposite direction. And that sensitivity faces inward as well as out: you're able to notice your own double motives and not take fright at them.
Now for what is hardest in this aspect. The sextile doesn't push. If you don't take a conscious step towards the themes of power, money, influence, real responsibility or inner work, the aspect stays in the background. I've sat with people who have a tight Sun–Pluto sextile in the chart and who, at forty, are living as though they were twenty-five — dodging the big projects, declining to take charge, hiding their ambition so as not to strike the people around them as too intense. The depth is there. It's asleep. That, more often than not, is what a squandered sextile looks like.
The ease of the aspect is deceptive. It creates the feeling that there's plenty of time — that the serious thing can be started later, that the conversation can be put off, that it's too soon to retrain, that you're not quite ready to talk about your worth. In truth, every month without a conscious move is another month the aspect has spent lying in the background. It doesn't vanish; it stays put. But it isn't being developed, and it isn't building any muscle.
So what do you do with this in practice? First, notice that you have access to Plutonic strength at all. Simply admit it: I can withstand other people's pressure, I can survive crises, I can make the kind of decisions that change my life afterwards. A lot of people with this aspect are afraid to grant themselves that, because depth feels like someone else's territory and they think of themselves as "ordinary". They aren't ordinary. They're under-noticed.
Second, begin with small, deliberate moves towards the themes you usually avoid. One difficult conversation you've been postponing for two years. One refusal to a person whose presence drains you. One project where you take responsibility for the result, not merely the process. One review of where you've set your own price. Each such move rocks the aspect out of the background and into a support, and within a year or so you'll notice that your inner density has become something you can lean on at any moment. If you'd like to see how exactly this aspect lands in your own natal chart — the orb, the houses, its links to the other planets — that's the kind of thing a full reading sets out.