The one who prays should lift up holy hands by forgiving anyone who has done him wrong, banishing the passion of anger from his soul, bearing antagonism to no one. And, so that his mind be not disturbed by extraneous thoughts, at the time of prayer he should forget everything apart from prayer. Is this not a state of supreme blessedness! So Paul teaches in the first letter to Timothy, when he says, ‘I desire therefore that men should pray in every place, lifting up holy hands free of anger and dissent’ (1 Tim 2.0).
Origen, in On The Lord’s Prayer, trans. Alistair Stewart Sykes, St. Vladimir’s Seminary Press, New York, 2004, p. 130-131.