Focusing exclusively on work and failing to dedicate any time to personal relationships will not lead to long-lasting contentment, as President Lyndon Johnson demonstrated. Though he had achieved tremendous things in his professional life, he was left with "absolutely no psychic or emotional resources left to get him through the days once the presidency was gone," according to historian Doris Kearns Goodwin. President Abraham Lincoln, on the other hand, did find time for pursuing interests other than work.

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