The problem of words being sharper than knives is that we have not equipped, conditioned our minds to reflect them. We all should learn that words may cause us bad feelings, but we should not let those feelings hurt us. No words are worth the pain. Render them useless, because your well being is the most important thing.
You are wright. But we havent everybody the same power of feeling. Should be great if we are able for not let those feelings hurt us.