C:

Winston Churchill:

• Men stumble over the truth from time to time, but most pick themselves
  up and hurry off as if nothing happened.
• The greatest lesson in life is to know that even fools are right sometimes.
• I am always ready to learn, although I do not always like being taught.
• A pessimist sees the difficulty in every opportunity; an optimist sees the
  opportunity in every difficulty.
• It is no use saying, "We are doing our best."
  You have got to succeed in doing what is necessary.
• Now this is not the end. It is not even the beginning of the end.
  But it is, perhaps, the end of the beginning.
• I felt as if I was walking with destiny, and all my past life had
  been but a preparation for this hour and this trial.
• The empires of the future are the empires of the mind.
• Never in the field of human conflict was so much owed by so
  many to so few.
• A lie gets halfway around the world before the truth has a chance
  to get its pants on.
• He has all the virtues I dislike and none of the vices I admire.
• Success is not final, failure is not fatal: it is the courage to
  continue that counts.
• Success is never permanent. Failure is never failure. The only thing
  that really counts is to never, never, never, give up.
• In defeat unbeatable: in victory unbearable.
• I know of no case where a man added to his dignity by standking on it.
• I have nothing to offer but blood, toil, tears and sweat.
• He is one of those orators of whom it was well said, "Before they get up,
  they do not know what they are going to say; when they are speaking, they
  do not know what they are saying; and when they have sat down, they do not
  know what they have said.
• It was the nation and the race dwelling all round the globe that had the lion's
  heart. I had the luck to be called upon to give the roar. I also hope that I
  sometimes suggested to the lion the right place to use his claws.

Confucius:

• I hear and I forget
  I see and I believe
  I do and I understand
  
• He who learns but does not think, is lost!
  He who thinks but does not learn is in great danger.
• A man who has committed a mistake and doesn't correct
  it, is committing another mistake.
• Real knowledge is to know the extent of one's ignorance.