Psalms 119:62

Prayer offered up at night possesses a great power, more so than the prayer of the daytime. Therefore all the righteous prayed during the night, while combating the heaviness of the body and the sweetness of sleep and repelling corporeal nature. And this the prophet also says, "I toiled in my groaning; every night I will wash my bed, with tears will I water my couch," while he sighed in fervent prayer. And again, "At midnight I arose to give thanks unto Thee for the judgments of Thy righteousness." And for every entreaty for which they urgently besought God, they armed themselves with the prayer of night vigil, and at once they received their request.

"At midnight," he says, "I rise to give thanks unto You: because of Your righteous judgments" [Psalm 119:62]. This very fact, that the bands of the ungodly surround the righteous, is one of the righteous judgments of God. On which account the Apostle Peter says, "The time has come when judgment must begin at the house of the Lord." [1 Peter 4:17] For he says this of the persecutions which the Church suffered, when the bands of the ungodly surrounded them. I suppose, therefore, that by "midnight" we should understand the heavier seasons of tribulation. In which he said, "I arose:" since He did not so afflict him, as to cast him down; but tried him, so that he arose, that is, that through this very tribulation he might advance unto a bolder confession.

In petition one asks for mercy for one's sins, in thanksgiving you give thanks to your Father who is in heaven, while in praise you praise him for his works. At a time when you are in trouble, offer up petition, and when you are well supplied with good things, you should give thanks to the Giver, and when your mind rejoices, offer up praise. Make all these prayers of yours with discernment to God. See how David was always saying, "I have risen to give thanks to you for your judgments, O just One." And in another psalm he said, "Praise the Lord in heaven, praise him in the heights." Again he says, "I will bless the Lord at all times, and at all times his praises are in my mouth." Do not pray using only one kind of prayer, but pray them at different times.