" Thus many believers walk heavily in the bitterness of their souls, conflicting with fears and doubtings all their days. And this is the cause that they have so little courage and fervency of spirit in the ways of God, and that they so much mind earthly things, and are so afraid of sufferings and death; and if they get some assurance by the reflex act of faith, they often soon lose it again by sins and temptations. The way to avoid these evils is to get your assurance, and to maintain it, and renew it upon all occasions by the direct act of faith, by trusting assuredly on the name of the Lord, and staying yourself on your God, when you walk in darkness, and see no light in any of your own qualifications (Isa. 50:10). I doubt not but the experience of choice Christians will bear witness to this truth. "

― Walter Marshall , The Gospel Mystery of Sanctification: Growing in Holiness by Living in Union with Christ