You have to do something to get something in return. Jonas wants freedom but he has to leave the community to get freedom in return for leaving. Even though jonas has all the food and protection he needs he
still has no freedom in the community. Because of this he has to live the life he has been living which is ok until he finds out what release is and that his father does it, and kills people.
To leave something you have some consequences to deal with after. For example in the text it explains that when jonas leaves he has the consequences of not having food, shelter and family other than Gabriel. This explains that Jonas has consequences for his actions to leave the community. Also the text explains when Jonas was a four that he was starving and the people over the community told him that he would never be starving. This shows that when Jonas left he left all the food, but he had freedom when he left.
Jonas’ experiences develop a theme over the course of The Giver by teaching the reader that freedom comes at a cost. So next time you ask for something from your parents or someone try to give them something in return.