Clement of Alexandria

Prayer is, then, to speak more boldly, converse with God. Though whispering, consequently, and not opening the lips, we speak in silence, yet we cry inwardly. For God hears continually all the inward converse. So also we raise the head and lift the hands to heaven, and set the feet in motion at the closing utterance of the prayer, following the eagerness of the spirit directed towards the intellectual essence; and endeavouring to abstract the body from the earth, along with the discourse, raising the soul aloft, winged with longing for better things, we compel it to advance to the region of holiness, magnanimously despising the chain of the flesh.