1) Philosophical concept 
The Tetrapharmakos (τετραφάρμακος), or, `The four-part cure,` is the Greek philosopher Epicurus` (341 BC, Samos – 270 BC, Athens) recipe for leading the happiest possible life. The `tetrapharmakos` was originally a compound of four drugs (wax, tallow, pitch and resin); the word has been used metaphorically by Epicurus and his d...