Seven times a day have I praised thee. By the adverb seven times, the Prophet means that he was continually or very often engaged in celebrating the praises of God; just as it is said in Proverbs 24:16, "A just man falleth seven times," when he often falls into divers temptations. [1] The phrase the judgments of God being in many places taken for the punishments which God inflicts upon sinners, and also sometimes applied in general to the providence by which he governs the world, some understand the Prophet as praising God because he affords such manifest proofs of his justice both in punishing the wicked and in the whole government of the world. But I rather agree with others who refer the phrase to the divine law; not that I dislike the former interpretation, but because in this psalm the great topic upon which the Psalmist chiefly insists is the commendation of God's law. The amount then is, that when David was assiduously occupied in meditating upon the law of God, he found it distinguished by so great perfection of righteousness and wisdom, that from time to time he burst forth into the exercise of praise and thanksgiving. This diligence in praising God shows that David not only spoke reverently and honourably of the divine law, but that he accounted it an inestimable boon conferred upon the human race. It was not simply admiration which constrained him to this commendation, but a principle of gratitude; for he saw that nothing more excellent could be bestowed upon men than their being renewed to a blessed and an endless life by the incorruptible seed of heavenly truth. Yet scarcely one in a hundred of those to whom God offers this treasure puts himself to the trouble of giving God thanks for it even in an ordinary manner. On the contrary, there reigns such vile ingratitude everywhere in the world, that some scornfully reject divine truth, and others despise or slight it, while others rail and gnash their teeth against it if they find anything in it which does not please them.

Footnotes

1 - Among many other texts of Scripture which might be quoted to show that the number seven is often used for many, or an indefinite number, we may refer only to Genesis 4:15 and Leviticus 24:18. Some of the Jewish Rabbies, however, affirm that David is here to be understood literally, observing, that the devout Hebrews were accustomed to praise God twice in the morning before reading the ten commandments, and once after; twice in the evening before reading the same portion of inspiration, and twice after; which makes up the number of seven times a day.

Seven times a day - The word seven may be used here, as it is often in the Scriptures, indefinitely to denote many, or often. There is, however, nothing which makes it necessary to understand it in this sense. The number of times in which it is proper and profitable to engage in secret or public devotion is nowhere specified in the Scriptures, but it is left, under a general direction, to be determined by each one as he shall find it desirable and convenient; as his feelings or his circumstances shall suggest. On another occasion Psalm 55:17 David mentions that he prayed "evening, and morning, and at noon;" at other times, perhaps, he might have found it in accordance with his feelings, or with his circumstances, to engage in devotion seven times in a day. There are circumstances in the lives of all good men when they are prompted to do this: times of trouble, of sickness, of bereavement, of danger, or of religious interest. There are states of mind which prompt to this, and when secret devotion becomes frequent, and almost constant; when nothing will satisfy the mind but prayer. No one would be injured by making it a rule, unless unavoidably prevented, to engage seven times each day in secret prayer, though, at the same time, no one could maintain that this is required as a rule by the Scriptures. The times, the circumstances, the manner, the place of secret devotion are wisely and properly left to each individual to be determined by himself. Religion is essentially voluntary, and the times of secret devotion must be voluntary, and therefore a man can easily determine, by his own secret devotions, whether he has any special interest at any particular time in religion, or whether he has any religion at all.
Do I praise thee - Do I engage in devotion.
Because of thy righteous judgments - Thy law, considered as righteous. I love that law, as such, and I praise thee for it.

Seven times a day do I praise thee - We have often seen that seven was a number expressing perfection, completion, etc., among the Hebrews; and that it is often used to signify many, or an indefinite number, see Proverbs 24:16; Leviticus 26:28. And here it may mean no more than that his soul was filled with the spirit of gratitude and praise, and that he very frequently expressed his joyous and grateful feelings in this way. But Rabbi Solomon says this is to be understood literally, for they praised God twice in the morning before reading the decalogue, and once after; twice in the evening before the same reading, and twice after; making in the whole seven times. The Roman Church has prescribed a similar service.
In a manuscript Saxon Homily, Domin. 3, in Quadrag, a.d. 971, I find the following singular directions: -
Every Christian man is commanded that he always his body seven times bless with the sign of Christ's cross.
1. First, at day-break.
2. Second time at undern tide, (nine o'clock in the morning).
3. The third time at midday.
4. The fourth time at noon-tide. (3 o'clock P.M.)
5. The fifth time in the evening.
6. The sixth time at night ere he go to rest.
7. The seventh time at midnight. A good man would do so if he awoke.
It seems that the sign of the cross was thought sufficient, even without prayer.

(b) Seven times a day do I praise thee because of thy righteous judgments.
(b) That is, often and various times.

Seven times a day do I praise thee,.... That is, very often in a day; not a day passed over his head but he praised the Lord, and often in the day; so the phrase "seven times" is used, Psalm 12:6. Praise is comely for the saints, delightful and well pleasing to God, being offered up in faith and through Christ; and should be frequent, since our mercies, temporal and spiritual, are daily renewed; and therefore we should always, in everything, for everything, and at all seasons, give thanks to God, Ephesians 5:20, 1-Thessalonians 5:18;
because of thy righteous judgments: either upon his enemies, the persecuting princes, as Aben Ezra; so saints may and should, and will praise the Lord, for his righteous judgments on the enemies of his church and people, because not only of their deliverance from them, but because of the honour of his justice, and the glory of his name; see Revelation 18:20; or because of the word of God, the precepts, ordinances, and doctrines of it, which are all righteous; for his knowledge of them, and for the benefit and comfort received from them; see Psalm 119:7.

Seven times - Many times; a certain number being put for an uncertain.