The mark of an educated man ...

The mark of an educated man is the ability to make a reasoned guess on the basis of insufficient information.
The mark of an educated man is the ability to make a reasoned guess on the basis of insufficient information.
 Abbott Lawrence Lowell

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

You will not accept credit that is due to another, or harbor jealousy of an explorer who is more fortunate.
 Abbott Lawrence Lowell
All that you may achieve or discover you will regard as a fragment of a larger pattern of the truth which from the separate approaches every true scholar is striving to descry.
 Abbott Lawrence Lowell
Of course there's a lot of knowledge in universities: the freshmen bring a little in; the seniors don't take much away, so knowledge sort of accumulates.
 Abbott Lawrence Lowell
A tale is told of a man in Paris during the upheaval in 1948, who saw a friend marching after a crowd toward the barricades. Warning him that these could not be held against the troops, that he had better keep way, he received this reply, " I must follow them. I am their leader.
 Abbott Lawrence Lowell