Charles Spurgeon was saved on January 6, 1850, and on February 1 he wrote the following prayer of consecration: O great and unsearchable God, who knowest my heart, and triest all my ways; with a humble dependence upon the support of Thy Holy Spirit, I yield up myself to Thee; as Thy own reasonable sacrifice, I return to Thee Thine own. I would be for ever, unreservedly, perpetually Thine; whilst I am on earth, I would serve Thee; and may I enjoy Thee and praise Thee for ever! Amen.

Wycliffe Handbook of Preaching & Preachers, W. Wiersbe, p. 235