My weaknesses... I wish I could come up with something. I'd probably have the same pause if you asked me what my strengths are. Maybe they're the same thing.
If your knowledge teaches you not to rise above human weakness and misery and lead your fellow man on the right path, you are indeed a man of little worth and will remain such till Judgment Day.
I do not love thee less for what is done,
And cannot be undone. Thy very weakness
Hath brought thee nearer to me, and henceforth
My love will have a sense of pity in it,
Making it less a worship than before.
It will not be we who reach Alpha Centauri, and the other nearby stars. It will be a species very like us - but with more of our strengths and fewer of our weaknesses.