A moving of the mind or soul; excitement of the feelings, whether pleasing or painful; disturbance or agitation of mind caused by a specific exciting cause and manifested by some sensible effect on the body.
Red is such an interesting color to correlate with emotion, because it's on both ends of the spectrum. On one end you have happiness, falling in love, infatuation with someone, passion, all that. On the other end, you've got obsession, jealousy, danger, fear, anger and frustration. Taylor Swift
Human behavior flows from three main sources: desire, emotion, and knowledge. Plato
Unconditional love really exists in each of us. It is part of our deep inner being. It is not so much an active emotion as a state of being. It's not 'I love you' for this or that reason, not 'I love you if you love me.' It's love for no reason, love without an object. Ram Dass
The oldest and strongest emotion of mankind is fear, and the oldest and strongest kind of fear is fear of the unknown. H. P. Lovecraft