See also Targum Neophyti Gen 25:27. Rachi writes that Jacob "is a plain man," and comments "He is not expert in all these (worthless pursuits), as is his heart (mind) so is his mouth. One who is not sharp minded in deceiving is called tâm (plain)," Rabbi Abraham Ben Isaiah and Rabbi Benjamin Sharfman, The Pentateuch and Rashi's Commentary: A Linear Translation into English, S. S. & R. Publishing Company: Brooklyn, N.Y., 1976, p. 244.