Most of Spock's advice might go to Captain Kirk, but he had a little to spare for a young fan who needed to his help.
In 1968 a girl identified only as "F.C." wrote a letter to Spock that appeared in the magazine FaVE. In the letter, F.C. said she was half white and half black, and that she felt like an outcast because of it. She ended the letter by saying "I guess I'll never have any friends."
The girl reached out to Spock because she identified with his half-human, half-Vulcan lineage, and felt that he could perhaps provide some insight. Leonard Nimoy was so moved by the girl's words that he composed a lengthy response describing how Spock dealt with the confusion and pain of being labeled a "half-breed." Nimoy described how Spock decided that since he wasn't accepted by the other children he grew up with, he decided that he'd forget about being popular and instead focus on bettering himself. He described how Spock decided it was more important to be true to himself.
Nimoy then explained what happened when Spock decided to devote his time to being smarter and stronger rather than more popular.
"He said to himself: 'Not everyone will like me. But there will be those who will accept me just for what I am. I will develop myself to such a point of excellence, intelligence and brilliance that I can see through any problem and deal with any crisis. I will become such a master of my own abilities and career that there will be a place for me. People of all races will need me and not be able to do without me.' And that's just what he did. And when I see him standing there on the bridge of the Enterprise, facing danger and life-and-death problems so cooly and with so much intelligence, I'm sure he made the right decision."
You can see the full text of Nimoy's letter below. Here's hoping F.C. took those words to heart and lived long and prospered.