To know one thing thoroughly would be to know the universe.
The one exclusive sign of thorough knowledge is the power of teaching.
If I find out where every dollar goes, and how it is used, I shall understand the apparatus thoroughly.
The height of ability consists in a thorough knowledge of the real value of things, and of the genius of the age in which we live.
The only fence against the world is a thorough knowledge of it, into which a young gentleman should be enter'd by degrees, as he can bear it; and the earlier the better, so he be in safe and skillful hands to guide him.
I won't write about a subject unless I've mastered it.
