Charles H. Spurgeon on Psalms 91:1

The shadow. The allusion of this verse may be to the awful and mystic symbols of the ark. Under the ancient ceremony, the high priest only could enter, and that but once a year, into the holy place, where stood the emblems of the divine glory and presence; but under the present bright and merciful dispensation, every true believer has access, with boldness, into the holiest of all; and he who now dwelleth in the secret place of prayer and communion with the God of salvation, shall find the divine mercy and care spread over him for his daily protection and solace. John Morison.