学而时习之，不亦说乎？有朋自远方来，不亦乐乎？人不知而不愠，不亦君子乎？ (《论语·学而》)

To learn and to practice what has been learned time and again is pleasure,is it not? To see friends from afar is happiness,is it not?(or How happy it is to see friends come afar!)To be unperturbed when appreciated by others is gentlemanly,is it not?;To learn and at due times to repeat what one has learned,is that not a pleasure? That friends should come to one from afar,is this not a delight?To remain unsoured even though one’s merits are unrecognized by others,is that not gentlemanly?(The Analects of Confucius)