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A friend's frown is better than a foe's smile
A friend to all is a friend to none
A friend is never known till needed
A friend in need is a friend indeed
A fox is not taken twice in the same snare
A foul morn may turn to a fair day
A forced kindness deserves no thanks
A fool's tongue runs before his wit
A fool may throw a stone into a well which a hundred wise men cannot pull out
A fool may ask more questions in an hour than a wise man can answer in seven years
A fool at forty is a fool indeed
A fool and his money are soon parted
A fool always rushes to the fore
A fly in the ointment
A fault confessed is half redressed
A fair face may hide a foul heart
A drowning man will catch at a straw
A drop in the bucket
A danger foreseen is half avoided
A curst cow has short horns
A creaking door hangs long on its hinges
A cracked bell can never sound well
A cock is valiant on his own dunghill
A close mouth catches no flies
A clear conscience laughs at false accusations