A tart temper never mellows with age; and a sharp tongue is the only edged tool that grows keener with constant use. - Washington Irving
Science is one thing, wisdom is another. Science is an edged tool, with which men play like children, and cut their own fingers. - Sir Arthur Eddington
Your soul: pure glucose edged with hintsOf tentative and half-soiled tints - Edith Sitwell
Understanding is a three edged sword: your side, their side, and the truth. - J. Michael Straczynski