Shiur from Rabbi Elimelech Kohn Ztl on פרשת לך לך.Discussed:

• Understanding the argument between Yitzchok and Yishmael regarding the ideal way to perform Mitzvas Bris Milah. Is it better to perform the Mitzvah as an intelligent thirteen-year-old or an innocent baby?
• Understanding the story of אחר (R' Elisha Ben Avuya), a great sage who went off the Derech. The Gemara cites the Pasuk טוב אחרית דבר מראשיתו, ascribing the father's wrong Kavanah during the Bris, which affected אחר later in life.