Unbelief rejects God's Son, the Lord Jesus Christ. Unbelief cannot receive God's blessings in Christ. Unbelief spurns the goodness of God. Unbelief is the choice of a heart that is hard against the goodness of God. It never considers that it could be wrong, even eternally wrong. Unbelief defiantly says, no, to all that God graciously offers in Christ. Unbelief is the sin that rejects the love, goodness, and grace of Christ. Unbelief rejects the promises of Christ as foolishness.
Unbelief cannot receive the blessings of God in Jesus Christ. Jesus said, "You believe in God, believe also in Me" (John 14:1). All the blessings of God come to us in Christ. "Blessed be the God and Father of our Lord Jesus Christ, who has blessed us with every spiritual blessing in the heavenly places in Christ" (Ephesians 1:3). Believing is receiving Christ.
The Holy Spirit comes to expose the sin of unbelief. Jesus taught that the Holy Spirit convicts of unbelief, "of sin, because they believe not in Me" (John 16:9). Don't let unbelief rob you of God's blessings in Christ. Unbelief rejects Christ.
Faith comes as an abiding gift of the Holy Spirit; unbelief rejects the gift of God in Christ. Faith testifies that Christ is trustworthy; unbelief will not trust in Christ. Faith walks in the light of Christ; unbelief is satisfied to stand in darkness without Christ. Faith in Christ comes from a heart transformed by the grace of God; unbelief comes from a hardened heart rejecting Christ.