God’s eternity should not be conceived…as an eternally static, immobile moment of time. On the contrary: it is identical with God’s being and hence with his fullness of being. Not only is God eternal: he is his own eternity. A true analogy of it is not the contentless existence of a person for whom, as a result of idleness or boredom, grief or fear, the minutes seem like hours and the days do not go but creep. The analogy lies rather in the abundant and exuberant life of the cheerful laborer, for whom time barely exists and days fly by. From this perspective there is truth in the assertion that in hell there is no eternity but only time, and that the more a creature resembles God and is his image, the more he or she will rise above the imperfections of time and approach eternity.
Herman Bavinck, Reformed Dogmatics, Vol. II, pg. 163.