Substitution Cipher Puzzle

This inspiring message, "Spread love everywhere you go and let no one ever come to you without leaving happier than before," is a profound philosophy attributed to Mother Teresa. Born Agnes Gonxha Bojaxhiu in 1910 in what is now Skopje, North Macedonia, Mother Teresa was an Albanian-Indian Roman Catholic nun who dedicated her life to selfless service among the poorest of the poor in Calcutta, India. She founded the Missionaries of Charity in 1950, an order recognized globally for its humanitarian work, and was awarded the Nobel Peace Prize in 1979 for her efforts. This particular quote encapsulates her core belief in spreading kindness and making a positive impact on every individual's life.

The puzzle itself is a cryptogram, which employs a substitution cipher. In this type of cipher, each letter of the original message is consistently replaced by a different letter or symbol to create the encrypted text. The history of substitution ciphers dates back to ancient times, with one of the most well-known early examples being the Caesar cipher, used by Julius Caesar around 50 B.C.. Although simple, these ciphers played a significant role in securing communications for centuries until methods like frequency analysis, first described by Arab scholars in the 9th century, emerged to break them.