Is the doubt or is the doubt?

Is curiosity the inspiration of doubt or is doubt the inspiration of curiosity?

Is doubt the lack of belief in an idea or is the logical representation of nonconformity with an idea?
Curiosity is the threshold to the little known or unknown in its entirety.

With these definitions, how to understand that being so different inspire each other. Since where there is curiosity there is doubt and where there is doubt there is curiosity ...

Actually, they are two divergent lines, the one does not exist without the other and they never touch each other since both doubt and curiosity at first seem to converge, that is only an illusion ... since depending on the circumstances; curiosity can lead us to a clear answer, since it confronts reality with all the dangers that entail and doubt, I could end up tearing the reality as it can make us flee to the path of fear with the false illusion of security and that path will never let us recognize reality even when we are in front of it ...

The moral would be: have curiosity inspired by doubt without abandoning the path of security ...