Abraham Lincoln was an introvert as well. The sixteenth president was known for withdrawing into himself, even to the point of being able to completely block out stimuli. Oftentimes, people had difficulty breaking into Lincoln’s withdrawn, trancelike state. It has been argued that Lincoln’s ability to debate and discuss topics successfully was due to much preparation and planning. It is believed that Lincoln was not the sort of man to “wing it.” As is commonly known, Lincoln was self-educated, spending what free time he had available to build upon what little formal education he had. Lincoln would borrow and read books repetitively, embracing the solitude involved with such an endeavor.