To what extent do we need evidence to support our beliefs in different areas of knowledge?

In fact, we do not always need to give evidence to our
beliefs when talking about knowledge. We have two different parts of knowledge. One is
about what is abstract like talking about beauty, for example. The second is about what
we really see or notice. An example of this is when we talk about the solar
system.

As for what is abstract, it is no use talking about
evidence. You talk about something being beautiful, for example, and you show the things
that make it beautiful. You talk about what is hidden or you can't talk about because it
differes from one person to another. This is because you are talking about your emotions
or feelings, so how can you convince others?

On the
contrary, talking about the things that we see or deal with is something more or less
easy. Let's talk about planes beying flying in the sky. Do we need to give evidences
about the process of flying? In this case, the fact that we need evidences when talking
about our beliefs is something controversial. In short, it depends on the thing that we
are talking about