Color Psychology

The many feelings that colors give us are, I admit, more opinion than are fact. But nevertheless opinions about colors can be dictated by popular opinion in a respective culture. For example, white in some eastern cultures represent death and mourning while in western cultures it is black. 
Then there's the concepts of colors being either warm or cool. Colors in the red spectrum are categorized as warm and they include red, orange and yellow. Warm colors are said to give off emotions that range from feelings of warmth to anger. Colors in the blue spectrum are categorized as cool and they include blue, purple and green. Cool colors are said to give off feelings of calmness, but also feelings of sadness or neutrality.
There's a wide range of meaning to all colors. To understand the best use of them in a design or composition is to study extensively on the subject.
Good luck on your personal journey.