Human beings are of four types:
1. Those who know, and know that they know. These are the scholars, so take time and patiently learn from them.
2. Those who know, but did not know that they know. These ones have forgotten, so quietly remind them.
3. Those who do not know, and know that they do not know. These ones are students, so teach them continuously because they will be great scholars one day.
4. Those who do not know, and do not know that they do not know and they aren't even interested in knowing. These ones are worthless, so dodge them".
