Do not go outside yourself, return to yourself: truth dwells in the interiority of man and, if you find that your nature is changeable, transcend yourself too.
Noli foras ire, in teipsum redi, in interiore homine habitat veritas. Et si tuam naturam mutabilem inveneris, trascende et teipsum.
Original text (Latin)
Notes from Wikiquote
As quoted in De vera religione, XXXIX, 72