It says that one who is learning Torah lishma, for its own sake gains many things. It also says that one who teaches os achas, one letter should be called rebbi, my teacher as Doag taught David Hamelech two things alone. Asks the Baal Shem Tov what is the proof from two things to one letter? He explains that one letter can multiply and add other knowledge (para verava) but Doag only taught him those two things alone. An example is כל המוסיף גורע one who adds takes away as it says אמתים וחצי ארכו two in a half its length. The GRA explains that the proof is not from אמתים because if you remove the aleph, we don’t know the measurement. The proof is from וחצי when we add a vov it becomes two amos and half, otherwise without the vov the meaning is two amos is half its length and the length would be four amos, so the vov diminishes its value. So one letter changes the meaning.
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