“It is a disgrace to grow old through sheer carelessness before seeing what manner of man you may become by developing your bodily strength and beauty to their highest limit. But you cannot see that, if you are careless; for it will not come of its own accord.”
Memorabilia III.7.8
Xenophon
Help us to complete the source, original and additional information
Socrates 168
classical Greek Athenian philosopher -470–-399 BCRelated quotes
Knowing Yourself: The True in the False (1996)
Source: Anam Cara: A Book of Celtic Wisdom

Source: You Learn by Living: Eleven Keys for a More Fulfilling Life

Lisa Heiserman Perkins NYTimes http://www.nytimes.com/2011/03/01/science/01angier.html?_r=0
About
Source: Between stigma and charisma: new religious movements and public mental health (Tussen stigma en charisma: nieuwe religieuze bewegingen en volksgezondheid) Deventer, Van Loghum Slaterus, page 343.