from Anatomy of Melancholy(!!):
Seek that which may be found. Seem not greater than thou art. Take thy pleasure soberly. Ocymum ne terito.

this is footnoted: 4066. Dum fata sinunt vivite laeti, Seneca.

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again, terito appears to be an inflected form of L. tero, to rub, rub away, wear away, bruise, grind, bray triturate.

one can make an impression by rubbing of course, but that doesn't seem to relate to rendering a picture of a mentally chosen subject.