Let us not, therefore, be discouraged by those interruptions and starts of our hearts.

   If we find in ourselves a strong resistance to them. The flesh will be lusting; that cannot be hindered; yet if we do not fulfill the lusts of it, rise up at its command, and go about its work, we may be said to walk in the Spirit (Galatians 5:16-17): we “walk in the Spirit,” if we “fulfill not the lusts of the flesh,” though there be a lusting of the flesh against the Spirit; so we worship in the Spirit, though there be carnal thoughts arising if we do not fulfill them; though the stirring of them discovers some contrariety in us to God, yet the resistance manifests that there is a principle of contrariety in us to them; that as there is something of flesh that lusts against the spirit so there is something of the spirit in worship which lusts against the flesh: we must take heed of omitting worship, because of such inroads, and lying down in the mire of a total neglect. If our spirits are made more lively and vigorous against them; if those cold vapors which have risen from our hearts make us, like a spring in the midst of the cold earth, more warm, there is, in this case, more reason for us to bless God, than to be discouraged. God looks upon it as the disease, not the willfulness of our nature; as the weakness of the flesh, not the willingness of the spirit. 

The Existence and Attributes of God (Vol. 1) - Stephen Charnock