(1) Too much clevernness is folly.

(2) Folly is an incurable disease.

(3) Answer a fool according to his folly. 

(4) Anger rests in the bosom of folly. Sentencedict.com 

(5) Folly is the cloke of knavery. 

(6) Anger begins in folly, and ends in repentance. 

(7) Anger begins with folly, and ends in repentance. 

(8) Beauty and folly are often companions. 

(9) It is the nature of folly to see the faults of others and forget his own. 

(10) If the fool would persist in his folly he would become wise. 

(11) Suddenly she saw the folly of it all.

(12) Somerville bitterly regretted his folly at becoming involved.

(13) In love folly is always sweet.

(14) Events proved the folly of such calculations.

(15) Time spent in vice or folly is doubly lost.

(16) If thou wouldest live long,[sentencedict.com]live well;for folly and wickedness shorten life.

(17) It is folly to buy such a junk at $100.

(18) It's utter folly to go swimming in this cold weather.

(19) He always sounds in folly.

(20) I was betrayed into folly.

(21) These facts demonstrate the folly of the policy.

(22) It would be folly to turn the offer down.

(23) It seems like an act of monumental folly.

(24) He was betrayed by social ambitions into irreparable folly.

(25) They have finally seen the folly of their ways.

(26) Learn wisdom by the folly of others.

(27) That would be an act of sheer folly!

(28) She said that the idea was folly.

(29) To flee vice is the begnning of virtue, and to have got rid of folly is the beginning of wisdom. 

(30) Politeness is not always the sign of wisdom, but the want of it always leaves room for the suspicion of folly.