Hayao Miyazaki said this quote

I’ve become skeptical of the unwritten rule that just because a boy and girl appear in the same feature, a romance must ensue. Rather, I want to portray a slightly different relationship, one where the two mutually inspire each other to live - if I’m able to, then perhaps I’ll be closer to portraying a true expression of love.

~ Hayao Miyazaki

Personally I am very pessimistic. But when, for instance, one of my staff has a baby you can't help but bless them for a good future. Because I can't tell that child, 'Oh, you shouldn't have come into this life.' And yet I know the world is heading in a bad direction. So with those conflicting thoughts in mind, I think about what kind of films I should be making.

~ Hayao Miyazaki

To be born means being compelled to choose an era, a place, a life. To exist here, now, means to lost the possibility of being countless other potential selves.. Yet once being born there is no turning back. And I think that's exactly why the fantasy worlds of cartoon movies so strongly represent our hopes and yearnings. They illustrate a world of lost possibilities for us.

~ Hayao Miyazaki

But remember this, Japanese boy... airplanes are not tools for war. They are not for making money. Airplanes are beautiful dreams. Engineers turn dreams into reality.

~ Hayao Miyazaki