Augustine of Hippo

Out of that confession of faith that is briefly contained in the creed and that, pondered according to the flesh, is the milk of babes but spiritually considered and studied is the food of the strong, arises the good hope of believers, which holy charity accompanies. But of all those things that are to be believed by faith, only those pertain to hope that are contained in the Lord's Prayer. For "cursed is everyone who puts hope in humankind," as the divine Scriptures testify; and, consequently, one who puts hope in himself is also ensnared in the chain of this curse. Therefore, we ought to make petition only of the Lord God, whatever it is that we hope to do well or to obtain as a reward for good works.