"Do not be deceived, God is not mocked; for whatever a man sows, that he will also reap."
Some people in the world see that life seems to operate according to the rules of cause and effect, and conclude then that the universe is like a giant clock, in no need of a Ruling sovereign. They will say "of course the wheat grows! It does not come from God, but science dictates that it must grows!" They do not realize that they very laws of science are from God. That God decrees that the wheat must grow, has put science in place, and continues to command science to continue in the same way. In the same way, cause and effect is seen in work, in relationships, etc. In the same way, this is not because there was no other way it could have happened, but rather because it pleases God to make the world operate generally in that manner.
On this tangent, when we sow evil, God justly judges us by giving us the reaping of that evil.
Beautiful and terrible case in point:
Ahab and his prophets...
2 Chronicles 18...
Then the king of Israel gathered the prophets together, four hundred men, and said to them, “Shall we go to war against Ramoth Gilead, or shall I refrain?”
So they said, “Go up, for God will deliver it into the king’s hand.”
But Jehoshaphat said, “Is there not still a prophet of the Lord here, that we may inquire of Him?”
So the king of Israel said to Jehoshaphat, “There is still one man by whom we may inquire of the Lord; but I hate him, because he never prophesies good concerning me, but always evil. He is Micaiah the son of Imla.”
All the false prophets lie. The King wants a lie (as we see, as the story unfolds) and God sends a lying spirit into the mouth of all those prophets. They know that this is not the truth from God...
Then he came to the king; and the king said to him, “Micaiah, shall we go to war against Ramoth Gilead, or shall I refrain?”
And he said, “Go and prosper, and they shall be delivered into your hand!”
So the king said to him, “How many times shall I make you swear that you tell me nothing but the truth in the name of the Lord?”
Then he said, “I saw all Israel scattered on the mountains, as sheep that have no shepherd. And the Lord said, "These have no master. Let each return to his house in peace."
This is incredible! Ahab knows that his victory is a lie, and asks for the truth. He, then, still rejects the truth...
Then the king of Israel said, “Take Micaiah, and return him to Amon the governor of the city and to Joash the king’s son; and say, ‘Thus says the king: “Put this fellow in prison, and feed him with bread of affliction and water of affliction, until I return in peace.”’
But Micaiah said, “If you ever return in peace, the Lord has not spoken by me.” And he said, “Take heed, all you people!”
Ahab's heart desired a lie, God gives him the lie he wants. God also gives him truth, and Ahab, who hears the truth and recognizes it as truth, blocked it from his heart, choosing instead to listen to what he knows is a lie. "Hearing, he hears not." Thus God gives him the reaping of what He had sown, and he perished in battle. What a sobering story.
Some may read the story and think to themselves, "Why would a God of truth send someone lies?" I may be wrong, but it seems to me that God wants all to believe truth, and He punishes those who want lies by giving them what they want. What a terrible and just punishment. In fact, it reminds me of hell. Some people simply want no part in God, and God gives them exactly what they ask for, sending them to the only existent place where He is not.
There are only two kinds of people in the end: those who say to God, 'Thy will be done,' and those to whom God says, in the end, 'Thy will be done.'
C. S. Lewis