A be rooted in B 即B是A的基础

I have always been an optimist and I supposed that is rooted in my belief that the power of creativity and intelligence can make the world a better place.这句话是由于有了信念才乐观的嘛？

be rooted in：植根于；根源在于；源自。直译即可，无需拐弯。
I have always been an optimist and I supposed that is rooted in my belief that the power of creativity and intelligence can make the world a better place.
【翻译】我一直是一个乐观主义者，我觉得这来源于于我的信念，即创造力和智慧可以使世界变得更美好。