But let him ask in faith
Not only in the faith of the divine Being that God is; but in the faith of the promises he has made; and in the faith of his power and faithfulness to perform them; and in the faith of this, that whatever is asked, according to the will of God, and is for his glory, and his people's good, shall be given.
about the thing asked for, whether it is right or no to ask for it; for that should be settled before it is asked for; nor about the power of God to do it; nor about his will, in things he has declared he will do; nor about his faithfulness to his promises; nor at all questioning but what is proper, suitable, and convenient, will be given in God's own time and way.
For he that wavereth is like a wave of the sea driven with the wind
he is troubled, restless, unquiet, and impatient; and he is fickle, inconstant, unstable, and unsettled; and is easily carried away with every wind of doctrine, temptation, and lust.