Pray without ceasing

"he prays too little, who is accustomed only to pray at the times when he bends his knees."

"perparum namque orat, quisquis illo tantum tempore quo genua flectuntur orare consueuit."

     St. John Cassian, Conferences 10.14, trans. Gibson (NPNF, 2nd ser., vol. 11, p. ).  Latin:  CSEL 13, p. 308, ll. 2-3.