Understanding 'serving'

'What do you want to be when you grow up??'

Often times, either a teacher or a president.

Last night I met a very cute and chirpy 7 yo boy who wanted to be a chef..
And when I asked why, he gave me this 'because then I can serve other'

He rendered me speechless.. How can a 7 yo boy fathom the very concept of serving when even the adults are struggling with it??