Tranquillity is the altered spelling of the word “tranquillity”. It is the quality of being tranquil, calm or serene. A peaceful mind is necessary to perform work with great efficiency. The word features in numerous writings of Buddha. In Buddhism, the term tranquillity is synonymous with the word “passadhi” which pertains to the serenity of human thoughts, body and conscience. Tranquillity of mind is essential for anyone who wants to become capable of handling even the most testing and adverse situations. Tranquillity of mind is very necessary to attain enlightenment or salvation. In the words of Charlotte Bronte, “It is vain to say human beings ought to be satisfied with tranquillity; they must have action; and they will make it if they cannot find it.”