"Jews have God's promise and if we Christians have it, too, then it is only as those chosen with them, as guests in their house, that we are new wood grafted onto their tree"

Karl Barth, a prominent Swiss Reformed theologian of the 20th century, was deeply participated in checking out the relationship between Christianity and Judaism. In this quote, he addresses the doctrinal connection and continuity in between the two faiths, stressing the shared spiritual heritage and the special status of the Jewish individuals in Christian thought.

Barth starts by acknowledging that the Jewish individuals possess "God's guarantee", which describes the covenants and dedications made by God to Israel as depicted in the Hebrew Scriptures. This pledge entails a special relationship with God, characterized by the election of Israel as God's selected people. For Barth, this fundamental guarantee is main to understanding the narrative of redemption history.

He then asserts that if Christians likewise take part in God's promise, it is not through supersession or replacement however rather through a shared addition with the Jewish individuals. Christians, according to Barth, are "picked with them", highlighting a faith of incorporation instead of exclusion or supremacy. This recommends a profound respect and acknowledgment of the enduring and irreversible covenant in between God and Israel.

By describing Christians as "guests in their house", Barth highlights a posture of humility and gratitude. The metaphor suggests that while Christians are invited to share in the spiritual blessings of God's promises, they do so as individuals in an existing and ongoing covenantal relationship initially established with the Jewish individuals. The image of being "new wood implanted onto their tree" further shows this point of addition and connection, utilizing a biblical metaphor from Romans 11 to highlight the concept that Jews stay the root of the covenantal tree, with Christians signed up with to this spiritual lineage through grace and faith.

Therefore, Barth's viewpoint fosters a nuanced approach to Christian-Jewish relations, promoting a sense of kinship and mutual regard while acknowledging the primacy of Jewish covenantal identity in the narrative of salvation. This view motivates Christians to value their shared theological heritage with the Jewish individuals, promoting a respectful discussion and a deeper understanding of their own faith's roots.