Begin at the beginning and go on till you come to the end: then stop. — Lewis Carroll. British author and scholar (1832–1898)
"When I use a word," Humpty Dumpty said in rather a scornful tone. "It means just what I choose it to mean - neither more or less." "The question is," said Alice, "whether you can make words mean so many different things." "The question is," said Humpty Dumpty, "which is to be master - that's all."
Be what you would seem to be -- or, if you'd like it put more simply -- Never imagine yourself not to be otherwise than what it might appear to others that what you were or might have been was not otherwise than what you had been would have appeared to them to be otherwise.
It is one of the great secrets of life that those things which are most worth doing, we do for others.