“Can your heart endure, or can your hands be strong, in the days that I will deal with you? I, Yahweh, have spoken it and will do it.”
God's warning comes loud and clear. Those who disobey His commandments will have to face His judgment. And do they think that they will then be able to endure or be strong in the face of God's enmity and anger? And they can be sure that it will happen, because God has said it.