Your strength is just an accident owed to the weakness of others.
And this also," said Marlow suddenly, "has been one of the dark places of the earth.
Any fool can carry on, but a wise man knows how to shorten sail in time.
The humblest craft that floats makes its appeal to a seaman by the faithfulness of her life.
The conquest of the earth, which mostly means the taking it away from those who have a different complexion or slightly flatter noses than ourselves, is not a pretty thing when you look into it too much.
We live in the flicker -- may it last as long as the old earth keeps rolling! But darkness was here yesterday.