David. R. Goodworth explores saying 3.13R/Th45 from his book 'The Gospel of Thomas: Evolution'.

Jesus said, “Grapes are not harvested from thorns, nor figs gathered from thistles, they do not yield fruit. A good man brings forth goodness from his storehouse, a bad man brings forth evilness from the evil storehouse which is in his heart, and he says evil things, for out of the abundance of his heart he brings forth evil things.”