“Custom is a second nature, and stronger than the first.”Michel de Montaigne · Eseuri · 1580 · I, 23
A habit repeated for years grows stronger than the nature we were born with.
Montaigne observes that what we do daily settles into character. A native instinct can be tempered by reflection, but a habit installed over decades acts automatically, beyond the reach of consciousness. The mechanism is simple: repetition removes effort, and the mind prefers the worn path. Someone who has smoked for twenty years fights not the craving but the gesture itself, sunk deeper than nature.
Why it matters It helps anyone trying to change behavior and puzzled by how hard it is: the struggle is not with the self but with years of automation.