Chap 3:5 Trust GOD from the bottom of your heart; don't try to figure out everything on your own. (MSG)
God asks us to be dependent on Him with all consciousness, not with a part of our heart but in all things. As humans its possible to try to work out things ourselves and try to figure out what we need to do. This also shows that our wisdom, strength is limited unless we rely on God. We should be confident that God is able and willing. BE WISE!