For true success ask yourself these four questions: Why? Why not? Why not me? Why not now?
James Allen

When it is not in our power to follow what is true, we ought to follow what is most probable.
Rene Descartes

The first precept was never to accept a thing as true until I knew it as such without a single doubt.
Rene Descartes

Propaganda, to be effective, must be believed. To be believed, it must be credible. To be credible, it must be true.
Hubert H. Humphrey

Every true prayer is a prayer of the Church; by means of that prayer the Church prays, since it is the Holy Spirit living in the Church, Who in every single soul 'prays in us with unspeakable groanings'.
Edith Stein

I hope it is true that a man can die and yet not only live in others but give them life, and not only life, but that great consciousness of life.
Jack Kerouac

True champions aren't always the ones that win, but those with the most guts.
Mia Hamm

There are always new, grander challenges to confront, and a true winner will embrace each one.
Mia Hamm

To die for an idea; it is unquestionably noble. But how much nobler it would be if men died for ideas that were true!
H. L. Mencken

The most costly of all follies is to believe passionately in the palpably not true. It is the chief occupation of mankind.
H. L. Mencken

Platitude: an idea (a) that is admitted to be true by everyone, and (b) that is not true.
H. L. Mencken

The true secret of giving advice is, after you have honestly given it, to be perfectly indifferent whether it is taken or not, and never persist in trying to set people right.
Henry Ward Beecher

A man's true state of power and riches is to be in himself.
Henry Ward Beecher

Religion is regarded by the common people as true, by the wise as false, and by the rulers as useful.
Lucius Annaeus Seneca

True happiness is... to enjoy the present, without anxious dependence upon the future.
Lucius Annaeus Seneca

What is true belongs to me!
Lucius Annaeus Seneca

One of the most beautiful qualities of true friendship is to understand and to be understood.
Lucius Annaeus Seneca

True praise comes often even to the lowly; false praise only to the strong.
Lucius Annaeus Seneca

It is true greatness to have in one the frailty of a man and the security of a god.
Lucius Annaeus Seneca

No man enjoys the true taste of life, but he who is ready and willing to quit it.
Lucius Annaeus Seneca