What difference, if you are mistaken? For if I am mistaken, I am. For he who is not, assuredly cannot be mistaken; and therefore I am, if I am mistaken. Therefore because I am if I am mistaken, how am I mistaken that I am, when it is sure that I am, if I am mistaken.
Saint AugustineNarrow is the mansion of my soul; enlarge Thou it, that Thou mayest enter in. It is ruinous; repair Thou it. It has that within which must offend Thine eyes; I confess and know it. But who shall cleanse it? or to whom should I cry, save Thee? Lord, cleanse me from my secret faults, and spare Thy servant from the power of the enemy. I believe, and therefore do I speak.
Saint AugustineDo you desire security? Here you have it. The Lord says to you, "I will never abandon you, I will always be with you." If a good man made you such a promise, you would trust him. God makes it, and do you doubt? Do you seek a support more sure than the word of God, which is infallible? Surely, He has made the promise, He has written it, He has pledged His word for it, it is most certain.
Saint Augustine