In teaching us how to pray, the Holy Spirit fills us with delight in God. He removes the spirit of bondage, which makes our prayers slavish. He makes us sensible of the greatness of our privilege in having such a God to come to. He fills us with such a desire for fellowship with God that instead of restraining prayer, we are glad of every excuse, which takes us to our Father's presence. And He does all this by revealing God to us.
Spiritual blindness is always the cause of spiritual deadness.
As someone had said, the great lack of our religion is, we do not know God. But the Spirit helps our infirmities. He reveals to us God as our Father. He tells us of our Father's love, of His readiness to meet the needs of His suppliant children. He encourages us to make our requests known.