Hypocrisy is the most difficult and nerve-racking vice that any man can pursue; it needs an unceasing vigilance and a rare detachment of spirit. It cannot, like adultery or gluttony, be practiced at spare moments; it is a whole-time job. – W. Somerset Maugham

Most of us are aware of and pretend to detest the barefaced instances of that hypocrisy by which men deceive others, but few of us are upon our guard or see that more fatal hypocrisy by which we deceive and over-reach our own hearts. – Laurence Sterne, 1760

At the entrance of a second person, hypocrisy begins. – Ralph Waldo Emerson

Saying is one thing, doing another. We must consider the sermon and the preacher distinctly and apart. – Michel de Montaigne