N

naturam expellas [expelles] furca, tamen usque recurret (L) You may drive out Nature with a pitchfork, but she will always come back.　― Horace, Epistulae 1: 10: 24.

natura non facit saltum [saltus] (L) Nature makes no leaps; nature works uniformly.

nec deus intersit nisi dignus vindice nodus (inciderit) (L) Let not a god intervene unless a knot occur worthy such a deliverer (＝god).　― Horace, Ars Poetica 191-92 (劇作についての注意: cf. 本文 deus ex machina).