Answer: The conclusion of the Lord’s Prayer (which is, For thine is the kingdom, and the power, and the glory, forever. Amen.₁), teaches us to enforce our petitions with arguments₂, which are to be taken, not from any worthiness in ourselves, or in any other creature, but from God₃; and with our prayers to join praises₄, ascribing to God alone eternal sovereignty, omnipotency, and glorious excellency₅; in regard whereof, as he is able and willing to help us₆, so we by faith are emboldened to plead with him that he would₇, and quietly to rely upon him, that he will fulfil our requests₈. And, to testify this our desire and assurance, we say, Amen₉.

1. Matt 6:13
2. Romans 15:30
3. Daniel 9:4; Daniel 9:7-9; Daniel 9:16-19;
4. Philippians 4:6
5. 1 Chronicles 29:10-13
6. Ephesians 3:20-21; Luke 11:13
7. 2 Chronicles 20:6,11
8. 2 Chronicles 14:11
9. 1 Corinthians 14:16; Revelation 22:20-21

For further study see:

1. WSC 107: What doth the conclusion the Lord’s prayer teach us?