Education and knowledge is very important. It gives skills such as critical thinking and gives you an understanding of the world which makes navigating life and making sound judgements and decisions easier. It tends to make one more open-minded and tolerant. Still you can have a good education and knowledge and still be an a_hole or have little education and be the most open minded accepting person on the planet. This is not a matter of outward appearance such as vocabulary and accent but a state of mind. A person's attitude and outlook is of critical importance.
Humility has its place but should not be overemphasized as it is also important to be assertive and stand up for what you believe in and challenge authority when necessary. In Australia we have the tall poppy syndrome - that is cutting people down to size if they give the appearance of being a show off. But this has the negative side effect of discouraging children from developing their talents or demonstrating what they know or asking questions in class. Anti-intellectualism can be as bad as intellectual pomposity. If you have a good vocabulary why would you not use it for fear of being criticised. Good vocabulary is often a matter of finding the best word to express the idea you are trying to communicate.