This verse is recited twice daily, because the deliverance from Egypt was more than a historic event. It was a deliverance from a state of enslavement, and this deliverance should repeat itself daily in everyone's life.
No enslavement and no tyranny are as ruthless and as demanding as slavery to physical desires and passions. Someone who is unable to resist a craving, and who must, like a brute beast, do whatever the body demands, is more profoundly enslaved than someone subject to a human tyrant. Addicted people are an extreme example of those who have become slaves to their bodies.
Dignity comes from freedom, in the capacity to make free choices, and hence, in our ability to refuse to submit to physical desires when our judgment indicates that doing so is wrong. Freedom from domination by the body is the first step toward spiritual growth."