1885  Our greatest weakness lies in giving up. The most certain way to succeed is always to try just one more time.
2174  There is never enough time to do everything, but there is always enough time to do the most important thing.
1999  When one door closes, another opens; but we often look so long and so regretfully upon the closed door that we do not see the one which has opened for us.
2332  “I am so clever that sometimes I don't understand a single word of what I am saying.”
1548  The greater danger for most men lies not in setting our aim too high and falling short, but in setting our aim too low and achieving our mark.