God will preserve the grief of the father for his sons, and, when he repays, then he will understand
Other versions
King James Version
God layeth up his iniquity for his children: he rewardeth him, and he shall know it. English Standard Version
You say, 'God stores up their iniquity for their children.' Let him pay it out to them, that they may know it.New International Version
It is said, 'God stores up a man's punishment for his sons.' Let him repay the man himself, so that he will know it!