"But if one learns Torah Shelo Lishma, it doesn't rise and remains in the Bais Hamedrash below."

"We shouldn’t need pleasure to want to connect with Hashem. We have to start out, though, with shelo lishmah, because we don’t do something unless we get pleasure out of it."

"And as Reb Yitzchak Frank reminds us, the shelo lishma mitzvah comes to us courtesy of the Yetzer Hora, who can be counted on to be sitting in the wings waiting to pounce at the first opportunity to stir the pot vis á vis our motivations." (source)