We must die, daily to ourselves in repentance, if we are going to live. The alternative is to falling on Christ in repentance is to be crushed by the sheer weight of His presence. But when that rejected stone falls on any one, it will crush him. Either receive the forgiveness, life, and salvation that Jesus won for you by His death on the cross, and trust in Him, or be crushed resisting and refusing His death and resurrection. Every sin is has been spoken for in the death of Jesus.
Every sin is forgivable.
Every sinner has been died for. Only unbelief is unforgivable. There is a piece of Gospel irony in this parable. The wicked tenants thought that by killing the son they could gain the inheritance. And in a twisted way, they were right.