Proverbs 11:18 (NKJV) — 18 The wicked man does deceptive work, But he who sows righteousness will have a sure reward.
Why “sure things” fail. The wicked person develops a scheme he thinks is foolproof. He believes he has all the angles covered. It is a sure thing in his mind. But it is a deceitful work. While it may appear to be certain to succeed, actually it is doomed to fail. But those who do right can be certain of the reward; it is a sure reward. It is always right to do right.