Prayer is the sure way that leads to holiness. Alas! we easily enter on the road to perdition when we neglect prayer. The prayer which humbles the soul, which inflames her with love and excites her to the practice of virtue, is never subject to illusion. In prayer the soul is united to God through love, He who, on account of the duties of his state of life, cannot devote much time to prayer, need not be troubled; the exact fulfilment of his duties, with a pure intention, having only God in view, is an excellent prayer.
--St. Paul of the Cross