1st, persevering and continuous, after the example of Christ our Lord; 2dly, watchful, and poured forth from the heart, after the example of the priest who, in the preface which precedes the prayer, prepares the minds of the brethren by saying Sursum Corda, to which the people answer Habemus ad Dominum; 3dly, associated with good works and alms, like that of Tobias and Cornelius; 4thly, at every hour of the day, and especially at the three hours appointed by the Church for prayer, to wit, the third, the sixth, and the ninth hour; and, moreover, we must pray morning and evening.