Give thanks in all circumstances; for this is the will of God in Christ Jesus for you. — 1 Thess 5:18
For although they knew God, they did not honor him as God or give thanks to him, but they became futile in their thinking, and their foolish hearts were darkened. — Romans 1:21
Our thankfulness is no benefit to God, yet he is pleased with it, as it showeth our honesty and ingenuity. And to us Christians, the very life and soul of our religion is thankfulness; therefore, God will have us continually exercised in it: “Let us offer the sacrifice of praise continually, that is, the fruit of our lips, giving thanks unto his name” (Heb 13:15).
As our understanding was given us to think of God, and know him; so our speech was given us to speak of God, and praise him. We praise God for all his works, we give him thanks for such as are beneficial to us. In praise, we ascribe all honour, excellency, and perfection unto him. In giving thanks, we express what he hath done for ourselves or others. Now this must be done continually, for God is continually beneficial unto us, by daily mercies giving us new matter of praise and thanksgiving. Besides, there are some mercies so great, that they should never be forgotten.
The Complete Works of Thomas Manton, 3:108.