What this quote means

Diderot's observation reminds us that every moral rule, however just, carries its share of constraint or difficulty. No principle applies without friction in reality. This invites us not to idealize precepts but to consider them with lucidity, accepting that virtue sometimes demands sacrifices. It is in moments when following a principle costs us that our integrity truly reveals itself.

How to apply it daily

Identify a moral principle you follow out of habit and reflect on what it costs you. Consciously decide to uphold it despite the discomfort, owning that choice.