The Law by itself was unable to save anyone since no one was capable of its fulfilment. Thus the Law served (initially) only to increase sin since it posed many rules available to be broken. However, it was through the Law (rather than by the Law) that the possibility of salvation would come. One man, came and fulfilled the Law. This righteousness was imputed to some through faith, which altered their eternal destiny. Now sure of a right relationship with God, and with knowledge of God's eternal promise, they were free to enter into a genuinely loving relationship with God, and they love God by loving others.