If human happiness, whose perfection it is to be united with God, were hidden from man, he would in fact be bereft of the principal use of his understanding. Thus, also the chief activity of the soul is to aspire tither. Hence, the more anyone endeavors to approach to God, the more he proves himself endowed with reason.
– John Calvin
as quoted by Piper, John; When I Don’t Desire God: How to Fight for Joy; copyright 2004; Crossway Books; Wheaton, Il.; p. 16