I believe I know my own mind, for example.
Our reasoning comes from our immediate environment which is predominantly finite based.
I also believe we have two minds, one time based and the other based on timelessness.
I think faith comes to being when we are thinking from a time based mind to a mind based on timelessness, however, it's no longer faith when we become our mind based on timelessness. The reason for this is we become aware, once we become aware, it's no longer faith.