John Owen: what should we pray for?

What God hath promised, all that he hath promised, and nothing else, are we to pray for; for "secret things belong unto the Lord our God" alone, but the declaration of his will and grace belongs unto us, and is our rule. Wherefore, there is nothing that we really do or may stand in need of but God hath promised the supply of it, in such a way and under such limitations as may make it good and useful unto us; and there is nothing that God hath promised but we stand in need of it, or are in some way or other concerned in it as members of the mystical body of Christ. Owen, Works, vol 4, On the Work of the Holy Spirit in Prayer