God, the Only Source of Happiness For the Soul

The soul of man has a natural desire of happiness: nothing can make it happy but what is commensurable to its desires, or capable of affording it a full satisfaction. Nothing less than an infinite good is such: and God Himself only is an infinite good, in the enjoyment of which the soul can rest, as fully satisfied, desiring no more. Now, since by reason of the vast capacity of the soul, nothing but God Himself can indeed satisfy this its desire of happiness, the which is so woven into the very nature of the soul, that nothing but the destruction of the very being of the soul can remove it; it is evident, that it is impossible the soul of man can ever find true rest, until it return to God, and take up its rest with Him; but must still be in quest of, or desiring its chief good and happiness, wherein it may rest, and this in reality is God Himself only; though the practical understanding being blinded, knows not that, and the perverse will and affections carry away the soul from Him, seeking the desired good and happiness in other things. It is so consistent with man's nature, that it will remain forever in the damned in hell; a chief part of whose misery will lie in that this desire shall ever be rampant in them, but never in the least satisfied; they shall never be freed from this scorching thirst there, nor yet get a drop of water to cool the tongue. - Edward Fisher, The Marrow of Modern Divinity, page 246.