It has been said: "The best way to destroy your enemies is to make
them your friends."

Anybody know where it came from?

Hello 1advisor and thank you for your question.

There are several sources stated for this quotation, but by far the
most popular attributation is to Abraham Lincoln.  I have not been
able to confirm that this is historical fact so I have not posted this
as an answer.

Try this search strategy:
"enemy is to make * your friend" lincoln
://www.google.com/search?hl=en&lr=&ie=UTF-8&oe=UTF-8&as_qdr=all&q=%22enemy+is+to+make+*+your+friend%22+lincoln


"The best way to destroy your enemies is to make them your friends."
- Abraham Lincoln
http://www.cob-net.org/inspire/laugh.htm

Some other stated sources:

"As Roosevelt said; "the best way to destroy your enemies is to make
them your friends"
http://www.childrens-express.org/dynamic/public/Teen_talk_terrorism_081001.htm

"An Israeli proverb says rightly: "The only way to get rid of your
enemies is to make them your friends."
http://www.reliefweb.int/w/rwb.nsf/0/17edc48b75b0737dc1256b450061f885?OpenDocument

Very best regards
THX1138

I can confirm thx1138's response....Barlett's, among other several
other sources, credit your quote to our 16th President, Abraham
Lincoln.