In nubibus—In the clouds.
In nuce Ilias—An Iliad in a nutshell.
In obscuro—In obscurity.
In old age nothing any longer astonishes us. Goethe.
In old times men used their powers of painting 35 to show the objects of faith; in later times they used the objects of faith to show their powers of painting. Ruskin.
In omni re vincit imitationem veritas—In everything truth surpasses its imitation or copy. Cic.
In omnia paratus—Prepared for all emergencies. M.
In omnibus quidem, maxime tamen in jure, æquitas est—In all things, but particularly in law, regard is to be had to equity. L.
In one thing men of all ages are alike; they have believed obstinately in themselves. Jacobi.
In oratory the will must predominate. Hare. 40