What can you serve, but never eat? A tennis ball.
可以端到面前（serve），但却不可以吃的是什么？网球。

Maturity begins to grow when you can sense your concern for others outweighing your concern for yourself. — John MacNaughton
当你能感觉到你对别人的关心超过了对自己的关心时，你就真正开始成熟了。——约翰·麦克诺顿

Soon you’ll realize that many people will love the idea of you, but will lack the maturity to handle the reality of you. — Reyna Biddy
很快你就会意识到，很多人都喜欢理想中的你，却却没有足够的成熟来面对现实的你。——雷纳·比迪

The true maturity is when somebody hurts you and you try to understand their situation instead of trying to hurt them back.
真正的成熟是当有人伤害你的时候，你试着理解他们的处境，而不是试图报复他们。