It is by doubting that we come to investigate, and by investigating that we recognize the truth.

Nothing can be believed unless it is first understood; and that for any one to preach to others that which either he has not understood nor they have understood is absurd.

Language is generated by the intellect and generates the intellect.

And now, my friend, I am going to expose to you all my weaknesses. All men, I believe, are under a necessity of paying tribute at some time or other to Love, and it is vain to strive to avoid it. I was a philosopher, yet this tyrant of the mind triumphed over all my wisdom; his darts were of greater force than all my reasonings, and with a sweet constraint he led me wherever he pleased.

God considers not the action, but the spirit of the action.

In comparing your sorrows with mine, you may discover that yours are in truth nought.. and so shall you come to bear them the more easily grateful that they are not worse.

Be precise in the use of words and expect precision from others