Knowledge is power.
I am of the opinion that wise people can not only use their wisdom to improve themselves.but also guide others to use their intelligence to differ between good and bad experience.
A person who is having experience in one field can understand other fields also easily as the logic and the methodology will remain the same in almost all the fields. Our experience makes us understand things easily and we can easily visualise how tasks are inter-connected. When you go deep into the subject definitely you will find similarities in different issues.