In Old Testament times, vows were taken seriously and fulfilled completely. No one had to make a vow, but once made, it was binding (Deu 23:21-23). The vows mentioned here involved promises to praise God for his answers to prayer.
Psalms 65:3
Although we may feel overwhelmed by the multitude of our sins, God will forgive them all if we ask sincerely. Do you feel as though God could never forgive you, that your sins are too many, or that some of them are too great? The good news is that God can and will forgive them all. Nobody is beyond redemption, and nobody is so full of sin that he or she cannot be forgiven.
Psalms 65:4
Access to God, the joy of living in the Temple courts, was a great honor. God had chosen a special group of Israelites from the tribe of Levi to serve as priests in the Tabernacle (Num_3:5-51). They were the only ones who could enter the sacred rooms where God's presence resided. Because of Jesus' death on the cross, believers today have access to God's presence in every place and at any time.
Psalms 65:6-13
This harvest psalm glorifies God the Creator as reflected in the beauty of nature. Nature helps us understand something of God's character. The Jews believed that God's care of nature was a sign of his love and provision for them. Nature shows God's generosity—giving us more than we need or deserve. God's abundant generosity should make us grateful to him and generous to others.