The elder warned us not to pray while our hearts were steeped in unprayerful feelings, without thoughts wandering as they chose. Prayer is not a mechanical activity, but a confrontation, a conversation with the Holy Presence. Pray humbly, then, in awe of God.
When you take a dirty floor ... and make it spotlessly clean, and this polish it until it shines, it radiates back to you the love which you poured into it; the divinity of that floor has been drawn forth.