Chasidut zu Tehillim 105:3

"Because you would not serve the LORD your God in joy and gladness over the abundance of everything," (Devarim 28:47) This can be properly explained through the words of the Ikarim (2:15), which briefly explained are as follows. The wise have joy in that they feel the have achieved some of the wholeness of wisdom...and though this joy of necessity has some end limitation, since it is the product of human comprehension which is itself limited, nevertheless it grows continually. This is because anyone who seeks something which is of a limited nature, once they achieve it their desire and joy will cease. However, if that which one desires and seeks has no fundamental limit, then the desire and the comprehension will never cease. This is why the joy of the wise is continual and unceasing, as it is written "...let all who seek the LORD rejoice." (Psalms 105:3) In that God and his perfection are limitless all those who seek God, though they will grasp what they do, nonetheless will be left ever desiring. The joy will never cease, increasing as one comprehends ever more.