Wherever there is pleasure, there is pain. You cannot have absolute happiness in a relative physical plane of pairs of opposites. The pairs of opposites rotate in their turn. Death follows life. Night follows day.
Light follows darkness.
Pain follows pleasure. One part of pleasure is mixed with fifteen parts of pain. Pleasure that is mixed with pain, fear and worry is no pleasure at all. If you carefully begin to analyze this one part of pleasure also, it will dwindle into an airy nothing. You will find that it is mere play of the mind.