Sanctify them through Thy truth: Thy word is truth. – John 17:17
Sanctification is a higher word than purification; for it includes that word and vastly more: it is not sufficient to be negatively clean; we need to be adorned with all the virtues. Children of God should exhibit the love of God, they should be filled with zeal for His glory, they should live generous, unselfish lives, they should walk with God, and commune with the Most High. Our Lord Jesus contemplated the sending of each one of us into the world even as the Father sent Him into the world; but how can He give a mission to unsanctified men and women? Must not the vessels of the Lord be clean? Without sanctification we cannot enjoy the innermost sweets of our holy faith. The unsanctified are full of doubts and fears; and what wonder? The unsanctified often say of the outward exercise of religion, “What a weariness it is!” and no wonder, for they know not the internal joys of it, having never learned to delight themselves in God. If they walk not in the light of the Lord’s countenance, how can they know the heaven below which comes of true godliness? Oh, it is a prayer that needs to be prayed for me, for you, for this church, and for the whole church of God! “Father, sanctify them through Thy truth.” ~ C.H. Spurgeon
https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/1890.cfm