To not underestimate

1. You might receive sub par work. If you underestimate a person's ability and set them to a task beneath their skill level, then there is a chance you'll receive less then their best.
2. It could prove dangerous. By underestimating, you risk courting danger with both eyes closed. In unfamiliar situations, it is best to maintain at least some degree of caution.
3. You could make a mistake. If your preparations prove insufficient, then whatever you are working on might suffer a setback.
4. You could miss important information.
5. When you underestimate someone, you may lose a chance to make a friend.
6. When you underestimate something, you cut yourself off from future opportunities within that activity.
7. You could become overwhelmed due to not fully understanding the situation.
8. You could be surprised. By underestimating, you leave yourself open for the unanticipated.
9. You cheat yourself. By underestimating your ability, you hinder your own growth.
10. By underestimating another's work, you not only insult them, but deny yourself an opportunity to enjoy their work.