Today: Repent or Harden Your Heart

It is by God's grace that we are given sensitivity to God's Holy Spirit, and by God's grace that we are given strength to obey when we know what God wants. Each such time is a crossroads: do we obey (or repent if we are convicted), or do we harden our hearts? What are the consequences of both? And what is every believer's role in the life of brothers and sisters in faith, regarding these things?