Those who have not ...

Those who have not distinguished themselves at school need not on that account be discouraged. the greatest minds do not necessarily ripen the quickest.
Those who have not distinguished themselves at school need not on that account be discouraged. the greatest minds do not necessarily ripen the quickest.
 John Lubbock

More phrases

If one does not know to which port one is sailing, no wind is favorable.
What a distressing contrast there is between the radiant intelligence of the child and the feeble mentality of the average adult.
We are masters of the unsaid words, but slaves of those we let slip out.
I have always found that mercy bears richer fruits than strict justice.
A lie gets halfway around the world before the truth has a chance to get its pants on.

Quotes from the same author

What we see depends mainly on what we look for.
 John Lubbock
A day of worry is more exhausting than a day of work.
 John Lubbock
Cultivate all your faculties; you must either use them or lose them
 John Lubbock
Fresh air is as good for the mind as for the body. Nature always seems trying to talk to us as if she had some great secret to tell. And so she has.
 John Lubbock
Earth and Sky, Woods and Fields, Lakes and Rivers, the Mountain and the Sea, are excellent schoolmasters, and teach some of us more than we can ever learn from books.
 John Lubbock