At the end of Hebrews 4 we have three great principles for going through the wilderness—the Word, the priesthood and the throne.
The Word searches the thoughts and intents of the heart—all that is working in the mind and will.
The priesthood sustains, in grace, in every infirmity, difficulty and trial.
The throne is perfect grace—though it is a throne. It is absolute sovereign power, positive government in grace, according to the character and majesty of Him who sits there. We go there boldly, for all is grace, and the great High Priest is for us with God. I am sure to find mercy and help there, for He who sits there is sovereign goodness and can bless righteously and graciously because of the Priest.
J. N. Darby (from Notes and Comments, Vol. 4)