Speak For Meaning

(idiomatic) To represent an intrinsic quality

Example: Used other than as an idiom: see speak,‎ for.
To speak on somebody's behalf.
  I think I speak for the whole group when I say that we're glad you came.
  Be sure to speak for a seat early, if you plan to attend.
  You really do deserve to be published - your recent articles speak for themselves.