Prayer must not be our chance work, but our daily business, our habit and vocation. As artists give themselves to their models, and poets to their classical pursuits, so must we addict ourselves to prayer. We must be immersed in prayer as in our element, and so pray, without ceasing. Lord, teach us so to pray that we may be more and more prevalent in supplication. – Charles Spurgeon (1834-1892), from a meditation on Psalm 109.4.