Lincoln made extraordinary efforts to attain knowledge while working on a farm, splitting rails for fences, and keeping store at New Salem, Illinois.

WHITEHOUSE: Abraham Lincoln

Those individuals who attempt to hoard knowledge, relationships, or resources to attain job security should not to be valued or viewed as indispensable, but should be admonished as ineffective and deemed a liability.

FORBES: Seth Godin's Linchpin Theory: Sound Advice or Career Suicide?