'Labor to enter into rest' means striving to cease from self-effort and trust fully in Christ’s completed work.
In Hebrews, the call to 'labor to enter into that rest' paradoxically encourages believers to exert effort in ceasing from their own works and relying entirely on Christ's finished work for their salvation. The rest referred to is a spiritual state where believers no longer depend on their own efforts to achieve righteousness but rather rest in the sufficiency of Christ's atoning sacrifice. This exhortation highlights the struggle against the natural inclination to maintain a works-based mentality, urging believers to trust in God's grace alone for their salvation.
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