In proportion as pleasures increase, the susceptibility for them decreases: what is customary is no longer felt as a pleasure. Just in this way, however, is the susceptibility for suffering increased, for the loss of what we are accustomed to is painfully felt.
 Arthur Schopenhauer, The World as Will and Representation (1819). copy citation

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Author Arthur Schopenhauer
Source The World as Will and Representation
Topic loss suffering
Date 1819
Language English
Reference
Note Translated by R. B. Haldane and J. Kemp
Weblink http://www.gutenberg.org/files/40868/40868-h/40868-h.html

Context

“Therefore we do not become conscious of the three greatest blessings of life, health, youth, and freedom, so long as we possess them, but only after we have lost them; for they also are negations. We only observe that days of our life were happy after they have given place to unhappy ones. In proportion as pleasures increase, the susceptibility for them decreases: what is customary is no longer felt as a pleasure. Just in this way, however, is the susceptibility for suffering increased, for the loss of what we are accustomed to is painfully felt. Thus the measure of what is necessary increases through possession, and thereby the capacity for feeling pain. The hours pass the quicker the more agreeably they are spent, and the slower the more painfully they are spent; because pain, not pleasure, is the positive, the presence of which makes itself felt.” source