He who desires to be in an assured state, to have continual fellowship with God, to attain to a higher level of illumination & experience, and to fear God steadfastly, let him strictly observe his devotional time and let him not be neglectful in this.
God did not send Christ into the world to be the Savior of all, but only for His elect. Christ suffered as a Surety and High Priest, and the merits of Christ and their application are inseparable.
If you have been overcome by darkness, do not give up courage, for many of the godly come into this condition. It is not a sign of being without grace.