Whether the times for the Church fast are fittingly ascribed?

Objections

Objection 1 : It would seem that the times for the Church fast are unfittingly appointed. For we read (Mt. 4) that Christ began to fast immediately after being baptized. Now we ought to imitate Christ, according to 1 Cor. 4:16, "Be ye followers of me, as I also am of Christ." Therefore we ought to fast immediately after the Epiphany when Christ's baptism is celebrated.
Objection 2 : Further, it is unlawful in the New Law to observe the ceremonies of the Old Law. Now it belongs to the solemnities of the Old Law to fast in certain particular months: for it is written (Zach. 8:19): "The fast of the fourth month and the fast of the fifth, and the fast of the seventh, and the fast of the tenth shall be to the house of Judah, joy and gladness and great solemnities." Therefore the fast of certain months, which are called Ember days, are unfittingly kept in the Church.
Objection 3 : Further, according to Augustine (De Consensu Evang. ii, 27), just as there is a fast "of sorrow," so is there a fast "of joy." Now it is most becoming that the faithful should rejoice spiritually in Christ's Resurrection. Therefore during the five weeks which the Church solemnizes on account of Christ's Resurrection, and on Sundays which commemorate the Resurrection, fasts ought to be appointed.