He who learns, teaches.

You cannot give what you do not have. You only give what you have. In the same way, you cannot teach what you do not know. And to know is to learn.

You would have to learn, that is, commit yourself to seeking knowledge, and upon having had enough knowledge, you put yourself in the position to teach – where teach means imparting the knowledge you have got to others.

It is possible to come across people who know nothing but are trying to teach. Such people only make a fool of themselves and come to no good for they make matters worse than what it was.