How do we know that Christ’s calling is heavenly?

In the sermon, it is emphasized that the heavenly calling is initiated by God and not by human effort. In Hebrews 3:1, the term refers to the purifying and transformative effect of being called by God to share in this divine relationship. The calling involves Jesus as both the apostle and the high priest, indicating His role as an ambassador bringing God's message and His sacrificial high priesthood that reconciles believers to God. This calling is irresistible for those chosen by God to be partakers of this heavenly promise.