Jesus is being extreme in both cases because many wanted only the miracles they didn’t want the deep connection and relationship that ensures eternal life and a successful life in the Kingdom here on earth as well….you can not be light, life, salt if you are not completely connected and in intimate relationship with the one who is all of these things himself….the belief is a daily communion with him, daily living a life that is Jesus pouring through us…we are light, life, salt, hope, joy, love and all of these things because that is how he is and we are daily becoming one with Him.