"Why?" is a fine response to a statement of intent; but "How do you know that?" as a response to a declarative statement used for motivation can often be more e

"Why?" is a fine response to a statement of intent; but "How do you know that?" as a response to a declarative statement used for motivation can often be more enlightening. (This kind of epistemological work-out is handy in lots of other situations. When the JWs or Mormons show up at your door, asking "How do you know that?" repeatedly is often all that you need to do until they give up and go away.)