Not only spontaneity, but confidence

"A little child has confidence. Grown-ups may be standing back at a distance and being very formal with some great personage, but then the man’s child comes running in, rushing right in, and holds on to her father’s legs. She has a right that no-one else has. God is no longer a distant God to us. He is not merely a God in whom we believe intellectually, theologically, theoretically, doctrinally only. All this is possible to one who is not a child of God at all. Our worship and praying [must] have the spontaneity of the child who sees the father, and not only spontaneity, but confidence." D. M. Lloyd-Jones

"For we do not have a high priest who is unable to sympathize with our weaknesses, but one who in every respect has been tempted as we are, yet without sin. Let us then with confidence draw near to the throne of grace, that we may receive mercy and find grace to help in time of need." Hebrews 4:15-16