Loving in truth, and vain in verse my love to show, That she (dear she) mighttake some pleasure of my pain, Pleasure might cause her read, reading might make her know; Knowledge might pity win, and pity grace obtain.

-Shute, Nevil originally Nevil Shute Norway
Astrophel and Stella, sonnet1.

Summum Mentis bonum est Dei cognitio, et summa Mentis virtus Deum cognoscere. The greatest good of the mind is the knowledge of God, and the greatest virtue of the mind is to know God.

-Spinoza, Baruch also known as Benedict de Spinoza
  Ethics, bk.4, prop.28.

You know more than you think you do.

-Spock, Dr Benjamin McLane
  The Common Sense Book of Baby and Child Care, opening words.

I pulled to the side of the street and got out my book of road maps.But to find where you are going, you must know where you are, and I didn't.

-Steinbeck,John Ernest
  TravelsWith Charley In Search of America.

It was easier to conquer it than to know what to do with it.

-Walpole, Horace, 4th Earl of Orford
  Of the Orient. Letter to Sir Horace Mann, 27 Mar. In The Correspondence of HoraceWalpole (Yale edition,1937^8).

When will the world know that peace and propagation are the two most delightful things in it?

-Walpole, Horace, 4th Earl of Orford
  Letter to Sir Horace Mann,7 Jul. In The Correspondence of HoraceWalpole (Yale edition,1937^8).