Only in the biblical revelation is the tension between law and love resolved, with vast social and historical implications, in the person and work of Jesus Christ. By His perfect righteousness and His vicarious atonement, the strictest requirements of law and justice were fully met and fulfilled, and the statutes of God observed to every jot and tittle, and yet, at one and the same time, the love of God unto salvation manifested in and through Him. The cross thus is the symbol of the unity of law and love in Jesus Christ and of the full requirements and mutual integrity of both. The radical injustice of every order apart from Christ is overcome by this synthesis, and the historical realization of an order founded on this unity, as yet unrealized, is opened up. The attempts of men to create an equitable and livable order apart from the atonement have been doomed to radical collapse, as witness Julius Caesar's attempt to supplant the failing law with his graceless clementia. Love or forgiveness which is unable to regenerate man becomes only a license to and subsidy of evil, and law itself is equally incapable of any creative role or regenerating function.
Excerpted from Thy Kingdom Come Rousas John Rushdoony pages 43-44