One has to be insincere and promise something which you cannot fulfill. So you either have to be a fool who does not understand what you are promising, or deliberately be lying.

The point in history at which we stand is full of promise and danger. The world will either move forward toward unity and widely shared prosperity - or it will move apart.

A population that does not take care of the elderly and of children and the young has no future, because it abuses both its memory and its promise.

One can promise actions, but not feelings, for the latter are involuntary. He who promises to love forever or hate forever or be forever faithful to someone is promising something that is not in his power.

To all Americans tonight, in all of our cities and towns, I make this promise: We will make America proud again, we will make America strong again, we will make America safe again, and we will Make America Great Again! God bless you and good night! I love you!

The promise of this life is imperiled by the very genius that has made it possible.