Charles H. Spurgeon on Psalms 91:1

By secret here is meant a place of refuge from the storms of the world under the secret of his providence, who careth for all his children. Also, by the secret of the most High, some writers understand the castle of his mighty defence, to which his people run, being pursued by enemies, as the wild creature doth to his hole or den for succour, when the hunter hath him in chase, and the dogs are near. This then being the meaning of that which the prophet calleth the "secret place of the most High", and our dwelling in it, by confidence in him; we learn, in all troubles, to cleave to God chiefly or only for help, and to means but as underlings to his providence. . . . That which is here translated dwelleth, is as much in weight as sitteth, or is settled; and so, our dwelling in God's secret, is as much as our sitting down in it: the meaning is, we must make it our rest, as if we should say, Here will we dwell. From whence we learn, that God's children should not come to God's secret place as guests to an inn, but as inhabitants to their own dwellings; that is, they should continue to trust in God, as well in want as in fulness; and as much when they wither in their root, as when they flourish in it. Robert Horn.