Luke 6:44

"Either make the tree good, and his fruit good; or else make the tree corrupt, and his fruit corrupt: for the tree is known by his fruit."

"Can the fig tree, my brethren, bear olive berries? either a vine, figs? so can no fountain both yield salt water and fresh."

"These are spots in your feasts of charity, when they feast with you, feeding themselves without fear: clouds they are without water, carried about of winds; trees whose fruit withereth, without fruit, twice dead, plucked up by the roots;"