So solitude can mean introspection, it can mean the concentration of focused work, and it can mean sustained reading. All of these help you to know yourself better.
“He who should inspire and lead his race must be defended from travelling with the souls of other men, from living, breathing, reading, and writing in the daily, time-worn yoke of their opinions.” ~ Emerson
People do not multitask effectively. And here’s the really surprising finding: the more people multitask, the worse they are, not just at other mental abilities, but at multitasking itself.
It seems to me that solitude is the very essence of leadership. The position of the leader is ultimately an intensely solitary, even intensely lonely one. However many people you may consult, you are the one who has to make the hard decisions. And at such moments, all you really have is yourself.