Merit vs Evil

Make hast in doing good: check your mind from evil; for the mind of him who is slow in doing meritorious actions delights in evil.

Should a person commit evil, he should not do it again and again; he should not find pleasure therein: painful is the accumulation of evil.

Should a person perform a meritorious action, he should do it again and again; he should find pleasure therein: blissful is the accumulation of merit.

Buddhism. Dhammapada 116-18