Peace is a state where you forget everything!Happiness is a state where you enjoy the surrounding! Bliss is a state where you remain in peace longer time&there you knows that nothing is important.Angry and fear is a state where expected too much and worry too much respectively!
Each bite of knowledge taking us one step ahead in the path of life. It's not going to stop us from the end; but it can reduce the pain in life what it going through. Every philosophy and science created on the base of it only. And I am pretty sure that it will remain like that till the life goes in this universe.