Heart-suffering because of sin is the best proof that the Holy Spirit dwells in your heart.
Johann ArndtFor even these are no less bestowed on him of pure grace, than are righteousness and salvation themselves.
Johann ArndtConsider then, O man! whether there can be anything more wretched and poor, more naked and miserable, than man when he dies, if he be not clothed with Christ's righteousness, and enriched in his God.
Johann ArndtBut since the world, which thou art to strive against, is not without thee, but within thee, it follows, that it is also to be conquered not without, but within thee.
Johann Arndt