Ps 5 7 But I, by your great mercy,
will come into your house;
in reverence will I bow down
toward your holy temple.
 8 Lead me, O LORD , in your righteousness
because of my enemies-
make straight your way before me.

Our path in this life is only successful because of Gods mercy,  Because we walk in the path of Gods righteousness we cannot be successful according to our own efforts or goodness. The Psalmist teaches that Gods house is not just the Temple. God is holy because He controls and sustains the entire creation. We live in His house. His house is merciful. We are alive because God is merciful and He has accomplished every thing in Christ.

The Psalmist prays to God in the attitude of total dependence. If God does not lead us in His righteousness then we could not be sustained. The Psalmist expresses his total dependence on God by praying for the ability and not just the success. God makes us able by leading us. So the Psalmist approaches God in the words of creating the Psalmist ability. Lead me, do not let, let them, do not reject me, show me the way, etc. We walk in the way of mercy by the cry for ability.

The Psalmist describes these words of creation as "the cry" Gods righteous path is the display of His works on our behalf. The Psalms are Gods spoken pronouncements of His work in His house .He  responds by crying out to God. He is always asking God to be merciful as he meditates on the Psalms.We must learn to pray short prayers asking God to meet every need.We must ask Him to help us at any time and the smallest request.