The comparison is this: the fast is equivalent to a life with God, a life of things of God, a commitment to live for Him. The meat is equivalent to sin. People choose to partake of sin one last time before they begin a journey with God much like we are partaking of meat one last time before the fast begins. The problem is this: that one last, tantalizing partaking is never enough and often times, the one last time turns into a lifetime. The Bible tells us the wages of sin is death and while our intention was to only partake one last time, we end up entangled in our sin.
We fail to see the dangers of sin and therefore, we justify our longing for one last time. I guess it comes down to this: we wanted to eat the meat today because we knew we would be without it for the next 21 days. It was totally to satisfy our fleshly desire…..and that’s what sin is all about.