Fear is the strongest emotion because you can die from it.Anger is the second strongest because you can see red and loose control of your self. Next comes ying and yang, the border between the upper, and lower emotions. Here is where love and pain are equal, the border. And just below that comes Spiritually. All other emotions disseminate down from these 5 super  emotions. The part that gave me the clue that I am write is that they all come in waves. Fear comes in a wave, and so do all the rest. If you notice anger and fear don't mix. Love and pain mix, but not with fear or anger. The ying and yang is the boundary. Equal and completely the opposite are love and pain. Spirituality mixes with love and pain,but not with fear and anger. This I believe is the foundation of the first and most powerful emotions that a truly balanced human  can go through. Every other emotion follows below spirituality.