首先我要知道你想表达的意思，你似乎是想表达要做一个成熟强大的大人但是要保留童心?
如果要有哲理其实不难，我能想到很多种写法，随便写几个，take your pick
You grow up by overcoming your weakness, not your innocence.
Be a man in body and mind, be a child in heart and soul.
Be a fighter without, be a dreamer within.
Be confident without, be innocent within.
Be invincible without, be vulnerable within.
Wear the world's armour , to protect the child's heart.
Have an eyeful of wonder, and a handful of strength.
但是同时又要可爱难度