Psalms 132:12

If thy children will keep my covenant ... - This was the condition implied in the promise - that they were to keep the law of God, and to serve and obey him. If they did not, they could not, of course, plead the promise. This principle is universal. We cannot plead any promise of God in our behalf, or in behalf of our children, unless we obey his commands, and are ourselves faithful to him. See the sentiment in this verse illustrated in the notes at Psalms 89:30.