Charles H. Spurgeon on Psalms 135:20

Ye that fear the LORD, bless the LORD. In Scripture it is quite common to find this "fear" put for holiness itself, or the sum of true religion. It is not, therefore, such a fear as seized the hearts of our first parents when, hearing the voice of the Lord God, they hid themselves amongst the trees of the garden; nor such as suddenly quenched the noise of royal revelry in the night of Babylon's overthrow; nor such as, on some day yet future, shall drive despairing sinners to the unavailing shelter of the mountains and rocks. It is not the fear of guilty distrust, or of hatred, or of bondage —that fear which hath torment, and which perfect love casteth out; but a fear compatible with the highest privileges, attainments, and hopes of the Christian life. It is the fear of deep humility and reverence, of filial subjection, and adoring gratitude; the fear which "blesseth the Lord", saying, "His mercy endureth for ever." —John Lillie (1812-1867), in "Lectures on the Epistles of Peter."