The reason for renewal is in essence a return to the worship of God and making our hearts the altar for God.
“Though Ephraim built many altars for sin offerings, these have become altars for sinning… Though they offer sacrifices as gifts to me, and though they eat the meat, the LORD is not pleased with them. Now he will remember their wickedness and punish their sins: They will return to Egypt.” (Hosea 8 v 11, 13)
Renewal leads to the altar. Ritual becomes relationship and duty becomes devotion. The altars are not shared with other idols of our life. Renewal is pure worship. Our eyes are not on the benefits of worship (ie the meat) but the benefactor of our lives, God.
Renewal does not point to what we do for Him and the sacrifices that we make but rather it points to Him. Not everyone who gathers at the altar does so with a renewed heart.
“The sacrifices of God are a broken spirit; a broken and a contrite heart, O God, You will not despise” (Psalm 51:17).
Missions Paul 