Sadness

What is sadeness and what does it mean? Why do we feel this way? We try so hard to avoid it and yet it creeps up. We cannot fight even if we try. I will try and change for it to go away. Fear goes with sadness and that even makes it more unbearable. We cannot hide it from the world as it is part of our soul. The best in life is to love and life as though there is no tomorrow.