Free-will offerings were a type of peace offering of which the Israelite could eat a portion. It was intended to instruct and assure the people of the promise of a future in which there would be peace between God and his people. After the offering, there followed a meal presented by God to the Israelites—they would be satisfied with the goodness of the house of the Lord.
Today, we may approach God without the intercession of a priest because Jesus is our high priest (Hebrews 4:14–16), and we can now read Psalm 65 in this light. God has also chosen us to be his covenant partners.
4 Blessed is the one you choose and bring near, to dwell in your courts! We shall be satisfied with the goodness of your house, the holiness of your temple!