Silent prayer is…

Silent prayer, in its common form, is also profitable. Each has its peculiar advantages, as each has its place. There is also a modification of prayer, which may be termed the prayer of silence. This is a prayer too deep for words. The common form of silent prayer is voluntary. In the prayer of contemplative silence, the lips seem to be closed almost against the will.
–François Fénèlon (1651-1715)

Speaking to God…

Acquire the habit of speaking to God as if you were alone with Him, familiarly and with confidence and love, as to the dearest and most loving of friends.
–Saint Alphonsus Liguori (1696-1787)

Pray with the heart…

It is not enough to pray only with the tongue: we must, according to the Apostle, pray also with the heart if we wish to receive God’s graces: “Praying at all times in the spirit.”
–Saint Alphonsus Liguori (1696-1787)

Grace and desire to speak…

True, the greatest reverence is due to God; but if He gives you the grace of feeling His presence and the desire to speak to Him as to one who loves you more than anyone else, tell Him your thoughts freely and confidently.
–Saint Alphonsus Liguori (1696-1787)