Mikhail Bulgakov said this quote

I believe you!' the artiste exclaimed finally and extinguishes his gaze. 'I do! These eyes are not lying! How many times have I told you that your basic error consists in underestimating the significance of the human eye. Understand that the tongue can conceal the truth, but the eyes - never! A sudden question is put to you, you don't even flinch, in one second you get hold of yourself and know what you must say to conceal the truth, and you speak quite convincingly, and not a wrinkle on your face moves, but - alas - the truth which the question stirs up from the bottom of your soul leaps momentarily into your eyes, and it's all over! They see it, and you're caught!