Isn't it a pleasure to study and practice what you have learned? Isn't it also great when friends visit from distant places? If one remains not annoyed when he is not understood by people around him, isn't he a sage?
學而時習之、不亦說乎。有朋自遠方來、不亦樂乎。人不知而不慍、不亦君子乎。
Original text (Chinese)