Question on Children in the Covenant and Hebrews 10:29

This article addresses a theological tension in Reformed doctrine regarding how Hebrews 10:29 can speak of someone being 'sanctified by the blood of the covenant' while simultaneously describing apostasy and reprobation. Engelsma responds to a reader's question about reconciling covenant membership (which includes both elect and reprobate children) with biblical passages that seem to ascribe saving sanctification to those who later fall away, offering clarity on Reformed understanding of covenant status and election.