Leo occupies the middle of high summer, where the sun is strongest and steadiest. It's the only sign ruled by the sun, and in astrology the sun stands not for energy but for centre — the point everything else turns around. So Leo's subject isn't performance, it's whether there is a core at all: without one, whatever a person does drifts.
You'll recognise it here: you give warmth and mean it, rather than offering social politeness; being seen visibly lights you up, by a margin other people notice; and what you can't stand isn't criticism but being overlooked — criticism at least confirms you exist.
Running well, Leo is what makes other people visible too: a real sun doesn't only shine, it makes its surroundings apparent. You'll name someone's contribution out loud and introduce people onward, and only someone with a centre can do that. Blocked, Leo turns being responded to into a survival requirement — without applause you doubt your whole worth, and start performing a more likeable version, drifting further from yourself. The tradition connects Leo to the heart, and the link is literal enough: your force comes from what you actually care about. Do work you don't care about and no amount of applause will light you.
