You should fight to be among the best in school. The very best in every sense and you already know what that means; study and revolutionary attitude. In other words: good conduct, seriousness, love for the revolution, comradeship. I was not that way at your age but I lived in a different society, where man was an enemy of man. Now you have the privilege of living in another era and you must be worthy of it.

Birthday Letter to his Daughter (1966)