Pleasure in an index of increase of life; pain is an index of decrease of life. Who advocates this view?

Pleasure in an index of increase of life; pain is an index of decrease of life. Who advocates this view?

زندگی کے اضافے کے اشاریہ میں خوشی؛ درد زندگی کی کمی کا ایک اشاریہ ہے۔ اس نقطہ نظر کی وکالت کون کرتا ہے؟
Explanation

Herbert Spencer advocates this view. He argues that pleasure indicates an increase in life or vitality, while pain indicates a decrease in life or vitality.