Answer: You become less sensitive to some things and more sensitive to others. The main thing is to be sensitive to the connection with the friends, the group, and to be generally sensitive to being incorporated. This is what should impress you and cause an inner shivering, that should pressure you and excite you and cause you pain and joy.
You should look at all the corporeal aspects of life like food, sex, family, money, respect, and knowledge as useful and essential aspects only. I need all this in order to advance normally, on a level that “is not condemned and is not praised.” Make sure you have all the basic necessities and use this world according to your needs, but be above it in your thoughts and your intentions. Don’t be overenthusiastic or ascetic. Don’t regret what happens to you in this world. Don’t devote to this world any more than it deserves. On the corporeal level, you should use it rationally, and in sensation, you yearn for connection with the Creator through the group.
From the 4th part of the Daily Kabbalah Lesson 1/20/14, Writings of Baal HaSulam