Psalms 66:20 in the King James Version of the Bible reads: "Blessed be God, which hath not turned away my prayer, nor his mercy from me." This verse is a declaration of praise and thanksgiving to God for not rejecting the psalmist's prayers and for continuing to show mercy.

The book of Psalms is a compilation of 150 poetic songs and prayers that were used in worship and praise in ancient Israel. The psalms cover a wide range of emotions and themes, including praise, thanksgiving, lament, and petition. Psalms 66, in particular, is a psalm of thanksgiving and praise for deliverance from trouble.

The verse at hand expresses the psalmist's gratitude for God's faithfulness in hearing and answering prayers. It acknowledges the mercy and compassion of God, as well as the fact that He has not forsaken or turned away from the psalmist's cries for help. This verse reflects the psalmist's deep trust in God and his recognition of God's continued presence and grace in his life.

The theme of gratitude and thanksgiving is central to this verse. It highlights the psalmist's recognition of the blessings and deliverance that have come from God. The act of praising God for His faithfulness in answering prayers and showing mercy serves as a reminder to all believers to express gratitude for God's goodness and provision in their lives.

The context of this verse within the larger psalm is also significant. In the preceding verses, the psalmist recounts a time of distress and trouble when he called out to God for help. He describes how God has brought him through the trials and has answered his prayers. This sets the stage for the declaration of praise and thanksgiving in verse 20, as the psalmist reflects on the faithfulness of God in responding to his petitions.

The symbolism in this verse lies in the contrast between the faithfulness of God and the fickleness of human nature. The psalmist juxtaposes the unwavering nature of God's mercy and the tendency of humanity to forget or neglect the goodness of God. The image of God not turning away the psalmist's prayer signifies His steadfastness and willingness to listen and respond to the cries of His people.

In a broader theological sense, this verse also points to the character of God as being merciful and compassionate. It emphasizes the idea that God is a loving and caring deity who is attentive to the needs and pleas of His people. This is a source of comfort and reassurance for believers, as it affirms the belief in God's loving-kindness and His willingness to extend grace and mercy to those who seek Him.

In conclusion, Psalms 66:20 is a verse of gratitude and praise, expressing the psalmist's thankfulness for God's faithfulness in answering prayers and showing mercy. It serves as a reminder to all believers of the importance of acknowledging and praising God for His goodness and provision. The verse also highlights the symbolic contrast between God's unwavering mercy and the fickle nature of humanity, as well as pointing to the character of God as loving and compassionate. It is a powerful declaration of trust and reliance on God's faithfulness and grace.