What are some good books with sweet quotes available for purchase?

Some books with sweet quotes are Quotable Quotes from Reader's Digest, Best Quotations for All Occasions by Lewis Henry, and The Harper Book of Quotations 3rd Edition by Robert I. Firzhenry. While there are many more quote books available, you can also find sweet quotes on websites such as brainyquote.com, thinkexist.com, quotegarden.com, etc.