If there’s one thing anyone can benefit from in life, it’s always thinking of yourself as a student. It’s okay if you don’t know something as long as you’re willing to learn it.
Acting like you know everything not only is obnoxious to others, but it also tricks yourself into thinking you don’t need to keep learning, and that can be detrimental to both your career and your personal growth. Always be hungry for knowledge, and always be willing to admit when you don’t know something. Know-it-alls can only get so far.
See http://lifehacker.com/dont-be-a-know-it-all-be-a-learn-it-all-1794974291 
“Don’t Be a Know-It-All, Be a Learn-It-All”
If there’s one thing anyone can benefit from in life, it’s always thinking of yourself as a student. It’s okay if you don’t know something as long as you’re willing to learn it.