"A believer may be in the saddest and darkest condition imaginable. Even so, the Holy Spirit is able to break through all this and bring to mind the promises of Christ. By this work, the Holy Spirit enables Christians to sit in dungeons, rejoice in flames and glory in troubles. If he brings to mind the promises of Christ for our comfort, neither Satan nor man, neither sin nor the world, nor even death itself shall take away our comfort. Saints who have communion with the Holy Spirit know this only too well. Sometimes the heavens are black over them, and the earth trembles under them. Disasters and distresses appear which are so full of horror and darkness that they are tempted to give up in despair. So how greatly are their spirits revived when the Holy Spirit brings the words of Christ to their minds for their comfort and joy. Thus, believers are not dependent on outward circumstances for their happiness, for they have the inward and powerfully effective work of the Holy Spirit, to whom they give themselves up by faith."
John Owen, Communion with God (banner of truth) p.179