All - help if you can?

I believe the quote comes from antiquity (I will probably be embarrassed when it turns out to be a Kanye west lyric)

It goes something like 'the primary strength of a man is the ability to spend time alone in one's own company, in one place, for a period of time'

Would be much obliged, thanks!

There is this:

On the occasions when I have pondered over men's various activities, the dangers and worries they are exposed to at court or at war, from which so many quarrels, passions, risky, often ill-conceived actions and so on are born, I have often said that man's unhappiness springs from one thing alone, his incapacity to stay quietly in one room. A man wealthy enough for life's needs would never leave home to go to sea or beseige some fortress if he knew how to stay at home and enjoy it....~Blaise Pascal,
Penseés, "Diversion," 136.

It is generally shortened to: All mankind's troubles are caused by one single thing, which is their inability to sit quietly in a room.