Existential prayer is one form of mystical contemplation. It is the prayer of just being. It has few words; and perhaps it has no images at all. In this prayer I just AM -- like the flower of the field or the birds of the air; and by just being I give glory to God.
I have quitted all forms of devotion and set prayers but those to which my state obliges me. And I make it my business only to persevere in the Holy Presence, wherein I keep myself by a simple attention, and a general fond regard to God, which I may call an actual presence of God; or, to speak better, an habitual, silent, and secret conversation of the soul with God, which often causes me joys and raptures inwardly, and sometimes also outwardly, so great that I am forced to use means to moderate them and prevent their appearance to others.