It states in the holy book of Sefer Yetzirah, nothing is worse than pain and nothing is better than pleasure, however (as I understand,) this refers to the body; in regards to the soul, there is another system, which is always occurring; for the body, too much indulgence actually begins to erode both the pleasure – for as our sages teach, constant pleasure loses its pleasure – as well as literally destroys the health of the body – so in REGARDS to the soul, which its pleasure is deeper discoveries of Divine wisdom, this is an eternal process!