As we count between Pesach and Shavuos, we work to understand the unique potential and role of Adam. There are many elements of this, one of which is expressed through the ideas of shemittah and yovel, which we learn about in Parshas Behar. During those years, we are freed from our connection to the earth in order to serve Hashem completely, and remember that we are slaves only to Him. Many of our actions are motivated by nature or the society around us, but we want to be primarily motivated by the Torah and our connection to Hashem. It is in these areas that we can truly express our free choice.