From the Bible:
The Epistle of St. Paul to the Galatians contains this oft-quoted statement:
Be not deceived: God is not mocked; for whatsoever a man soweth, that shall he also reap.
From the fourth Chapter of the Bhagavad Gita:
“He who beholds inaction in action, and action in inaction, is wise among men; he is one with the Spirit; he has attained the true goal of action (perfect freedom).”