No one can prepare you for what heights you will soar until you spread your wings.

When quiting is no longer an option, you're half way there.

History will be kind to me for I intend to write it

From now on, ending a sentence with a preposition is something up with which I will not put

Don't argue about difficulties. The difficulties will argue for themselves.

The Russians will try all the rooms in a house, enter those that are not locked, and when they come to one that cannot be broken into, they will withdraw and invite you to dine genially that same evening.