Ever notice the vast vocabulary we have in English for emotional states? All those words must indicate something. Perhaps that we are not and never can be like Dr. Spock? Emotions get us in trouble. Emotions get us out of trouble. Books exist on how to control them. Even the Bible has something to say about them: Colossians 2:8 – Beware lest any man spoil you through philosophy and vain deceit, after the tradition of men, after the rudiments of the world, and not after Christ.
Can we accurately read emotions in another? Hell, can we accurately read our own emotions?
Nautilus has a thoughtful piece on reading emotions in others here.