The best Quotations

Do you know the writers of the following quotations?

Quotation Every journalist who is not too stupid or too full of himself to notice what is going on knows that what he does is morally indefensible. He is a kind of confidence man, preying on people's vanity, ignorance, or loneliness, gaining their trust and betraying them without remorse. - writer
Quotation The most terrible thing about materialism, even more terrible than its proneness to violence, is its boredom, from which sex, alcohol, drugs, all devices for putting out the accusing light of reason and suppressing the unrealizable aspirations of love, offer a prospect of deliverance. - writer
Quotation The wheel that squeaks the loudest is the one that gets the grease. - writer
Quotation Don't let your will roar when your power only whispers. - writer
Quotation I think it is an immutable law in business that words are words, explanations are explanations, promises are promises - but only performance is reality. - writer
Quotation You learn from a conglomeration of the incredible past - whatever experience gotten in any way whatsoever. - writer