Patañjali

The compiler of the Yoga Sūtras — one hundred and ninety-six terse lines defining yoga in the second of them as the stilling of the turnings of the mind, and laying out an eight-limbed discipline that begins with how you treat other people and ends in absorption.

The discipline's classical spine — and note where it starts: not with posture or breath but with restraint and observance, the ethical limbs. Every contemplative tradition on this bench puts conduct first, and every popular version of every one of them skips it.