“What you do not yet understand, Spock, is that Vulcans do not lack emotion. It is only that ours is controlled. Logic offers a serenity Humans seldom experience in full. We have emotions, but we deal with them… and do not let them control us.”
– Spock, to his younger self

In Star Trek: The Animated Series, episode “Yesteryear”, written by Dorothy “D.C.” Fontana.