Insperata accidunt magis sæpe quam quæ speres—What you do not expect happens more frequently than what you do. Plaut.
Inspicere, tanquam in speculum, in vitas omnium / Jubeo, atque ex aliis sumere exemplum sibi—I would have you to look into the lives of all, as into a mirror, and draw from others an example for yourself. Ter.
Inspiration must find answering inspiration. A. B. Alcott.
Inspirations that we deem our own are our 5 divine foreshadowing and foreseeing of things beyond our reason and control. Longfellow.
Inspiring bold John Barleycorn! / What dangers thou canst make us scorn! Burns.
Instar omnium—Like all the others.
Instead of the piteous and frightful figure of Death, stepping whip to hand by the peasant's side in the field, ... place there a radiant angel, sowing with full hands the blessed grain in the smoking furrow. George Sand.
Instead of watching the bird as it flies above our heads, we chase his shadow along the ground; and, finding we cannot grasp it, we conclude it to be nothing. Hare.
Instinct is a great matter; I was a coward on 10 instinct. 1 Hen. IV., ii. 4.
Instinct is intelligence incapable of self-consciousness. John Sterling.