My mouth shall shew forth thy righteousness and thy salvation all the day; for I know not the numbers thereof. Psalm 71:15
As John wrote of Jesus, that even the world could not contain the books that might be written of our Lord's wonderful works (Jn. 21:25), so the psalmist says of God's works in his own life. Every day and all day is a fitting moment of praise, every day and every hour to show forth God's righteousness and his salvation. For God's acts of mercy and grace toward his people are continuous (see Ps. 71:3, 5, 6) and thus innumerable (15).
For one thing, God upholds his elect in their being (along with every other thing, animate or inanimate). We don't exist on our own. We exist because Christ holds all things together (Col. 1:17).
But God's providence in the life of his children is more than just upholding them in mere existence. His purpose toward them is a good purpose, and they are the objects of his eternal and unchanging love, so that all things under God's good hand will work out for their good (Rom. 8:28). There is never a moment when they are not considered and cared for by him. He will never leave them or forsake them (Heb. 13:5-6). He has promised to be with us to the end of the age (Mt. 28:20). We are being continually cared for by our Father, so that we too can say with David, "for I know not the numbers thereof."
Let us therefore, with David, also "shew forth [God's] righteousness and [his] salvation all the day."