Charles H. Spurgeon on Psalms 55:17

Evening and morning, and at noon, will I pray. Often but none too often. Seasons of great need call for frequent seasons of devotion. The three periods chosen are most fitting; to begin, continue, and end the day with God is supreme wisdom. Where time has naturally set up a boundary, there let us set up an altar stone. The psalmist means that he will always pray; he will run a line of prayer right along the day, and track the sun with his petitions. Day and night he saw his enemies busy (Ps 55:10), and therefore he would meet their activity by continuous prayer. And cry aloud. He would give a tongue to his complaint; he would be very earnest in his pleas with heaven. Some cry aloud who never say a word. It is the bell of the heart that rings loudest in heaven. Some read it, "I will nurse and murmur; "deep heart thoughts should be attended with inarticulate but vehement utterances of grief. Blessed be God, moaning is translatable in heaven. A father's heart reads a child's heart. And he shall hear my voice. He is confident that he will prevail; he makes no question that he would be heard, he speaks as if already he were answered. When our window is opened towards heaven, the windows of heaven are open to us. Have but a pleading heart and God will have a plenteous hand.