The world of the living has many things.

Pain.

Suffering.

Sadness.

Despair.

Grief.

Loneliness.

Sorrow.

Misery.

Regret.

Gloom.

Detachment.

And on the other side,

Joy.

Pleasure.

Satisfaction.

Gratification.

Contentment.

Glee.

Gaeity.

Jubilance.

But to simplify, these are Emotions.

Emotions are things which gives colors to the lives of human beings.

Colors that vary from black that represents darkness and sorrow, to white to represent purity and happiness.

That's why every person living in this planet have colorful lives. We experience different things in our lives.

It depends on us if we take it negatively or positively.

Emotions that bring us what we desire are naturally a bright colors on our lists.

And by the definition of Meriam Webster, "Emotion is a conscious mental reaction subjectively experienced as strong feeling usually directed towards a specific object and typically accompanied by physiological and behavioral changes in the body."

You get the point.