Perseverance is the quality indispensable for achieveing any tasks. Determination is also needed especially when working for public interests. His Majesty King Bhumibol Adulydej the Great possessed these qualities as exemplified by his sailing from Klai Kangwol Palace across the Gulf of Thailand to Sattahip District. He spent 17 hours on narrow sailing boat of only 13 foot long. This success obviously arised from his perseverance. Moreover, His Majesty used perseverance in composing the book “Mahajanaka,” as he took a long time to use simple and easy-to-understand words and adapt them to fit the present time. Furthermore, the illustrations and Buddhist principles also make this books sacred. Thai people are encouraged to read the story, analyze and follow the footsteps of King Mahajanaka, the industrious king. Even he couldn’t see the shore, he still continues swimming. Without such perseverance, he would have fallen prey to crabs and fish and would be drown before reaching the shore.