One who deceives will always find those who allow themselves to be deceived.

The tyrant will always find a pretext for his tyranny.

413. He that once deceives is ever suspected.

Human beings seem to have an almost unlimited capacity to deceive themselves, and to deceive themselves into taking their own lies for truth.

It is as easy unwittingly to deceive oneself as to deceive others.

Men are so simple, and governed so absolutely by their present needs, that he who wishes to deceive will never fail in finding willing dupes.

There's always one who loves and one who lets himself be loved.

People always have been the foolish victims of deception and self-deception in politics, and they always will be until they have learnt to seek out the interests of some class or other behind all moral, religious, political and social phrases, declarations and promises.

When all else fails, there's always delusion.

The easiest person to deceive is one’s own self.

A greedy man will always find himself in the shackles of humility.

Anyone can deceive us .... for a time.
[KGB]

The wicked always finds an excuse for wrongdoing.

Man has an invincible inclination to allow himself to be deceived and is, as it were, enchanted with happiness when the rhapsodist tells him epic fables as if they were true, or when the actor in the theater acts more royally than any real king. So long as it is able to deceive without injuring, that master of deception, the intellect, is free; it is released from its former slavery and celebrates its Saturnalia. It is never more luxuriant, richer, prouder, more clever and more daring.