"Of Teddy Roosevelt and his siblings, the author writes they were, "armed with an innate curiosity and discipline fostered by his remarkable father. - Doris Kearns Goodwin

Early on, Abraham revealed a keystone attribute essential to success in any field — the motivation and willpower to develop every talent he possessed to the fullest.

I trust you will have the grace to go and hang yourself rather than attempt to belittle a nation by running for the presidency,

Unlike depression, melancholy does not have a specific cause. It is an aspect of temperament, perhaps genetically based. One may emerge from the hypo, as Lincoln did, but melancholy is an indelible part of one's nature.