Into a mouth shut flies fly not. Pr.
Into contradicting / Be thou never led away; / When with the ignorant they strive, / The wise to folly fall away. Goethe.
Into each life some rain must fall, / Some days must be dark and dreary. Longfellow.
Intolerabilius nihil est quam fœmina dives—There is nothing more insufferable than a rich woman. Juv.
Intra muros—Within the walls.
Introite, nam et hic dii sunt—Enter, for here too are gods. Heraclitus, from Arist.
Intuition is the clear conception of the whole 5 at once. It seldom belongs to man to say without presumption, "I came, I saw, I conquered." Lavater.
Intus et in cute novi hominem—I know the man inside and out. Pers.
Intus et in jecore ægro / Nascuntur domini—Masters spring up in our own breasts, and from a morbid liver. Pers.
Intus si recte, ne labora—If inwardly right, don't worry.