Ji Tianqi looked at the bustling training ground and suddenly recalled a saying, feeling a sense of admiration — The Master said, "Is it not a delight to learn and practise constantly? Is it not a joy to have friends come from afar? Is a man not a gentleman if he does not feel resentment when others do not understand him?"
The development and application of these new skills, for the Heaven's Creator, could be considered as acquiring knowledge and often revising and practicing it, that's why he was very happy.
Although they did not know that Ji Tianqi had arrived, they were indeed having a great time, and once they found out... Ji Tianqi believed they would be even happier.
As for the last part, Ji Tianqi found it quite suitable for himself — in this world, no one really shares his understanding, hence there is no one who can understand him.
[A sage is indeed a sage.]