Without temptations…

Without temptations, it is not possible to learn the wisdom of the Spirit. It is not possible that Divine love be strengthened in your soul. Before temptations, a man prays to God as a stranger. When temptations are allowed to come by the love of God, and he does not give in to them, then he stands before God as a sincere friend. For in fulfilling the will of God, he has made war on the enemy of God and conquered him.
–Saint Isaac of Syria (Seventh Century)

Three sorts of prayer…

Prayer is of three sorts. The one is perpetual: it is holy perpetual desire, which prays in the sight of God…  for this desire directs all thy works, spiritual and corporal, to His honor, and therefore it is called perpetual…The other kind is vocal prayer, when the offices or other prayers are said aloud. This is ordained to reach the third – that is, mental prayer: your soul reaches this when it uses vocal prayer in prudence and humility, so that while the tongue speaks the heart is not far from God… And whenever one felt one’s mind to be visited by God, so that it was drawn to think of its Creator in any wise, it ought to abandon vocal prayer, and to fix its mind with the force of love upon that wherein it sees God visit it.
–Saint Catherine of Siena  (1347-1380)