Pain is merely to much pleasure or pleasure is a reduced sense of pain. Extremes are hurtful and pain is the bodies way of telling the mind that it is in an extreme state. Thus pleasure is a reduced extreme, hence our like for new things. Every paradox is born from civilizations interaction with nature There may be no right Life goes in circles, but project those circles through time and you get a spiral. Thus history repeats itself but not exactly.
Truth only hurts if only a partial truth is accepted.
When you accept all truth it causes no pain. Life is a balance between what we want and what we get Super feats of physical strength or mental ability come under extreme pressure when the body and brain are not receiving enough oxygen, yet oxygen is said to power all cell functions. Happy life is a succession of new things followed by new things, but eventually this becomes not new and thus is boring. Few things can transcend this, accessing the mind in a was that is pleasurable no matter how old the stimuli is. This is done by bypassing consciousness and accessing a deeper part of the brain.