Many people think praising God is in singing only, hence it is difficult to tell of His strength. Only a child is able to tell of His strength [talking about the Messiah] without being shy and without any doubt.
It is very important to maintain being a child, lest you find yourself being disadvantaged and disqualified. Hence you hear people confessing that they do not understand the teachings. It is because they forsook being a child and thus it is not easy to grasp.