Imagination is more important than knowledge. For knowledge is limited, whereas imagination embraces the entire world, stimulating progress, giving birth to evolution.
The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge.
The more you know, the more you realize you know nothing.
Real knowledge is to know the extent of one's ignorance
If you think you are worth what you know, you are very wrong. Your knowledge today does not have much value beyond a couple of years. Your value is what you can learn and how easily you can adapt to the changes this profession brings so often.