The Cup of Sanctification from the Passover Seder reveals a profound truth about our spiritual identity. God declared the Israelites as His people while they were still enslaved in Egypt, not after their deliverance. This teaches us that belonging comes before breakthrough in our relationship with God. We don't earn our identity through performance or spiritual disciplines - God claims us as His beloved children even in our exhaustion and brokenness. True sanctification isn't about behavior modification but about abiding in who God says we are rather than striving to prove our worth.