Charles Spurgeon Commentary Ephesians 1:13-14

"in whom ye also, having heard the word of the truth, the gospel of your salvation,-- in whom, having also believed, ye were sealed with the Holy Spirit of promise, which is an earnest of our inheritance, unto the redemption of [God`s] own possession, unto the praise of his glory." — Ephesians 1:13-14 (ASV)

In whom you also trusted, after you heard the word of truth, the gospel of your salvation; in whom also after you believed, you were sealed with the holy Spirit of promise, which is the earnest of our inheritance until the redemption of the purchased possession, unto the praise of his glory.

Those who believe in Christ have the Holy Spirit dwelling in them: the Holy Spirit is a part of heaven, the earnest of our inheritance; and wherever he dwells, it is not possible that the heart should lose the inheritance. It is entailed upon those in whom the Spirit dwells. Judge, therefore, dear brothers, whether the Spirit of God dwells in you or not.