Charles H. Spurgeon on Psalms 145:10

All thy works shall praise thee, O LORD. There is a something about every creature which redounds to the honour of God. The skill, kindness, and power manifested in the formation of each living thing is in itself to the praise of God, and when observed by an intelligent mind the Lord is honoured thereby. Some works praise him by their being, and others by their well being; some by their mere existence, and others by their hearty volition. And thy saints shall bless thee. These holy ones come nearer, and render sweeter adoration. Men have been known to praise those whom they hated, as we may admire the prowess of a warrior who is our foe; but saints lovingly praise, and therefore are said to "bless." They wish well to God; they would make him more blessed, if such a thing were possible; they desire blessings upon his cause and his children, and invoke success upon his work and warfare. None but blessed men will bless the Lord. Only saints or holy ones will bless the thrice holy God. If we praise Jehovah because of his works around us, we must go on to bless him for his works within us. Let the two "shalls" of this verse be fulfilled, especially the latter one.