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Based on a stage play by Augustus Thomas, this silent takes a Biblical saying, "As a man thinketh in his heart, so is he," and applies it to the double standard of the then-modern era. Frank Clayton (Henry Clive) travels to Paris with his wife Elinor (Leah Baird). In steps the treacherous Benjamin deLota (Warburton Gamble). He was once friendly with Mrs. Clayton and attempts to renew that relationship, while at the same time getting Mr. Clayton tangled up with an artist's model. When the Claytons return to the States, Frank (who hasn't been so faithful himself) has doubts about his wife's fidelity that run so high, he begins to suspect that their son is not really his. As a Man Thinks was quite a powerful morality play for its time.