The pain-pleasure principle lies at the core of everything you do, and of everything you are. Your beliefs, values and psychological rules are all built upon this principle. The decisions you make, the actions you take, and the habits you indulge in, are all based upon this principle. In fact, every part of your psyche is influenced in some way by the pain-pleasure principle. You are therefore who you are today because of how you have interpreted and acted-upon the experience of pain and pleasure in your life. As we all know action always begins with a decision.
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