Let’s repay Christ with our patience

Let us, on the other hand, love the patience of God, the patience of Christ; let us repay to Him the patience which He has paid down for us! Let us offer to Him the patience of the spirit, the patience of the flesh, believing as we do in the resurrection of flesh and spirit.

Tertullian
On Patience
Chapter XVI

Ascetic struggle aids in prayer

In the first place, it is the affliction of the flesh—a victim able to appease the Lord by means of the sacrifice of humiliation—in making a libation to the Lord of sordid raiment, together with scantiness of food, content with simple diet and the pure drink of water in conjoining fasts to all this; in inuring herself to sackcloth and ashes.  This bodily patience adds a grace to our prayers for good, a strength to our prayers against evil; this opens the ears of Christ our God, dissipates severity, elicits clemency.

…That which springs from a virtue of the mind is perfected in the flesh; and, finally, by the patience of the flesh, does battle under persecution.

Tertullian 
On Patience
Chapter XIII

Every sin is a form of impatience

These (I mention) as the principal delinquencies in the sight of the Lord, for, to speak compendiously, every sin is ascribable to impatience. “Evil” is “impatience of good.” None immodest is not impatient of modesty; dishonest of honesty; impious of piety; unquiet of quietness.

Tertullian 
On Patience
Chapter V

Communion with the Lord through the martyrs

And we therefore, what we have heard and handled, declare also to you, brethren and little children, that as well you who were concerned in these matters may be reminded of them again to the glory of the Lord, as that you who know them by report may have communion with the blessed martyrs, and through them with the Lord Jesus Christ, to whom be glory and honour, for ever and ever.

The Passion of the Holy Martyrs Perpetua and Felicitas 
Preface

The Eucharist as a sacrifice

We are the true adorers and the true priests, who, praying in spirit, sacrifice, in spirit, prayer,—a victim proper and acceptable to God, which assuredly He has required, which He has looked forward to for Himself! This victim, devoted from the whole heart, fed on faith, tended by truth, entire in innocence, pure in chastity, garlanded with love, we ought to escort with the pomp of good works, amid psalms and hymns, unto God’s altar, to obtain for us all things from God.

Tertullian
On Prayer
Chapter XXVIII

Traditions regarding the hours of prayer

Touching the time, however, the extrinsic observance of certain hours will not be unprofitable—those common hours, I mean, which mark the intervals of the day—the third, the sixth, the ninth—which we may find in the Scriptures to have been more solemn than the rest.

… so that—what we read to have been observed by Daniel also, in accordance (of course) with Israel’s discipline—we pray at least not less than thrice in the day, debtors as we are to Three—Father, Son, and Holy Spirit: of course, in addition to our regular prayers which are due, without any admonition, on the entrance of light and of night. But, withal, it becomes believers not to take food, and not to go to the bath, before interposing a prayer; for the refreshments and nourishments of the spirit are to be held prior to those of the flesh, and things heavenly prior to things earthly.

Tertullian
On Prayer
Chapter XXV

Traditions regarding kneeling

In the matter of kneeling also prayer is subject to diversity of observance, through the act of some few who abstain from kneeling on the Sabbath; and since this dissension is particularly on its trial before the churches, the Lord will give His grace that the dissentients may either yield, or else indulge their opinion without offense to others. We, however (just as we have received), only on the day of the Lord’s Resurrection ought to guard not only against kneeling, but every posture and office of solicitude; deferring even our businesses lest we give any place to the devil.

At fasts, moreover, and Stations, no prayer should be made without kneeling, and the remaining customary marks of humility; for (then) we are not only praying, but deprecating, and making satisfaction to God our Lord. Touching times of prayer nothing at all has been prescribed, except clearly “to pray at every time and every place.”

Tertullian
On Prayer
Chapter XXII

On fasting and the Eucharist

Similarly, too, touching the days of Stations, most think that they must not be present at the sacrificial prayers, on the ground that the Station must be dissolved by reception of the Lord’s Body. Does, then, the Eucharist cancel a service devoted to God, or bind it more to God?  Will not your Station be more solemn if you have withal stood at God’s altar? When the Lord’s Body has been received and reserved each point is secured, both the participation of the sacrifice and the discharge of duty.

Tertullian
On Prayer
Chapter XIX