Clement of Alexandria

"And by this we know that we know Him, if we keep His commandments." For the Gnostic also does the Works which pertain to the province of virtue. But he who performs the works is not necessarily also a Gnostic. For a man may be a doer of right works, and yet not a knower of the mysteries of science. Finally, knowing that some works are performed from fear of punishment, and some on account of the promise of reward, he shows the perfection of the man gifted with knowledge, who fulfils his works by love.