He's an example to be followed not only as an athlete, but also as a person who is [a] symbol of discipline, maturity, humility.

discipline 来自拉丁语 disciplina（教学、训练），由词根 discip-（学习）和后缀 -line（表示状态或行为）组成。在这里指"自律"，即通过自我约束来保持良好的行为习惯。