Cryptograms

In each sentence below, one set of letters has been substituted for another. The words are in the correct order, with a space after each and correct punctuation. Each sentence has its own code. Can you figure out the substitutions and find the original sentences?

-1. LMG BYNL RFVVFDSZL LMFOQ FO LMG TYKZR FN LY POYT MYT LY RY C LMFOQ COR LY TCLDM NYBGYOG GZNG RY FL TKYOQ TFLMYSL DYBBGOL. -LMGYRYKG M. TMFLG

-2. OEDXRWJ CP LDEFFWBJ DECQ XR PX FSCVM CF VERRXF OW FBIW, ERQ ODEBRWJ CP LDEFFWBJ PX FSCR AW DXYW CF. -OCPSXT LIDFXR H. PSWWR

-3. BQDO BD UKO YDHGO JW JKRD WCZ NKGMCZDT OWOTDZGWCTMV, GJ IDKOT BD KZD UDKTGOH JW YD KNZKGX WN JQDI. GJ GT WN GIIDOTD GIAWZJKOUD JW MDKZO JW MKCHQ KJ WCZTDMPDT. -RKJQDZGOD IKOTNGDMX

-4. V PVD QGLJN NG DGHBWDT WI BM QVWHMN LDHWJ BM OGLJN NG WH RG QMJJ HBVH DG GDM QGLJN IWDN IVLJH QWHB QBVH BM BVN NGDM.-ZGBD BMDAX OVANWDVJ DMQPVD

-5. ACUQO ACREK HD UCYD IGQYUWOV WT COD ICREK TQEE WOXC GDY QYUB AWXGCRX TQEEWOV WOXC GDY GQOKB. -QUHYCBD HWDYID

1. The most difficult thing in the world is to know how to do a thing and to watch someone else do it wrong without comment. -Theodore H. White

Is laughter okay?

A laugh is worth 1,000 comments, Pandora

4. A man would do nothing if he waited until he could do it so well that no one would find fault with what he had done. ~ John Henry Cardinal Newman

So that's a no?

Well done, manxman!

3. When we can begin to take our failures nonseriously, it means we are ceasing to be afraid of them.
It is of immense importance to learn to laugh at ourselves. ~ Katherine Mansfield

Good solve, Flo!

2. Baloney is flattery laid on so thick it cannot be true, and blarney is flattery so thin we love it. ~Bishop Fulton J. Sheen

Well solved, manxman!

5. Woman would be more charming if one could fall into her arms without falling into her hands. -Ambrose Bierce

Whatever that means.