In a Calvinist view, the verse "I will bow down toward your holy temple, and give thanks to your name, because of your loyal love and faithfulness, for you have exalted your promise above the entire sky" (Psalm 138:2) is a declaration of the believer's gratitude to God for His love, faithfulness, and promises.

Calvinists believe that God has eternally chosen those who will be saved, and that this choice is based on His own good pleasure, not on anything in the person himself. This means that the believer's gratitude to God is not based on any merit of their own, but is simply a response to God's grace.

The phrase "bow down toward your holy temple" can be interpreted in a number of ways. It could refer to the physical temple in Jerusalem, which was the place where God's presence was said to dwell. However, it could also be interpreted as a symbolic gesture of worship, in which the believer bows down before God in spirit and in truth.

The phrase "give thanks to your name" is a way of expressing praise and adoration to God. It is a recognition of His greatness and His goodness.

The phrase "because of your loyal love and faithfulness" refers to God's unchanging love for His people and His faithfulness to His promises. This is a foundational belief of Calvinism, and it is what gives the believer hope and confidence in God.

The phrase "for you have exalted your promise above the entire sky" is a way of saying that God's promises are more important than anything else in the world. They are higher than the heavens, and they will never be broken.

This verse is a powerful reminder of God's love, faithfulness, and promises. It is a call to the believer to worship and praise God, and to give thanks for His goodness.