In Hezekiah’s day, “the priests had not sanctified themselves sufficiently” (II Chron. 30:3), and “the Levites were more upright in heart to sanctify themselves than the priests” (II Chron. 29:34). Imagine that—men who wanted to serve the Lord, but who didn’t want to sanctify themselves; that is, they didn’t want to set themselves apart unto God (Ex. 13:2 cf. v. 12).
How about you? Are you long on wanting to serve the Lord but short on wanting to set yourself apart as holy unto Him? If so, you should know that “this is the will of God, even your sanctification” (I Thes. 4:3). The Lord gave Himself for the Church “that He might sanctify and cleanse it with the washing of water by the Word” (Eph. 5:25,26). Why not determine to bury yourself in God’s Word, with the goal of learning how to be as pure as He died to make you now, in this life (Titus 2:14), and become “a vessel unto honour, sanctified, and meet for the Master’s use” (II Tim. 2:21). source