A humble and contrite heart knows that it can merit nothing before God, and that all that is necessary is to be reconciled to one's helplessness and let our holy and almighty God care for us, just as an infant surrenders himself to his mother's care.
God alone fully understands what each one of us needs; we make mistakes continually and pray for things which would be harmful to us if we received them. Afterwards we see our mistakes and realize that God is good and wise in not giving us these things, even though we plead ever so earnestly for them.