A Prayer for holy intention is the beginning and pursuit of any considerable action, as Study, Preaching, etc.

O eternal God, who has made all things for man and man for thy glory, sanctify my body and soul, my thoughts, and my intentions, my words and actions, that whatsoever I shall think, or speak, or do, may be by me designed to the glorification of thy name; and by thy blessing it may be effective and successful in the work of God, according as it can be capable. Lord, turn my necessities into virtue; the works of nature into the works of grace, by making them orderly, regular, temperate, subordinate, and profitable to ends beyond their own proper efficacy: and let no pride or self-seeking, no covetousness or revenge, no impure mixture or unhandsome purposes, no little ends and low imaginations, pollute my spirit, and unhallow any of my words and actions; but let my body be a servant of my spirit, and both body and spirit servants of Jesus; that doing all things for thy glory here, I may be partaker of thy glory hereafter: through Jesus Christ our Lord. Amen. Ad. Sect. 3.