This doubt is further strengthened when we turn to the record of Christ's own preaching. He is the final standard and incomparable model. But, though He discovered the soul and taught the world the value of the individual, His preaching was not exclusively directed to individuals. It had a public and national side. He cast His protection over publicans and sinners, not only because they were the children of men, but also because they were the seed of Abraham; He submitted His claims to the ecclesiastical authorities of the nation, and, when they rejected them, He directed against the religious parties the thunderbolts of His invective. The tears and words of indescribable tenderness which He poured out upon the city where He was about to be martyred proved that the patriotism of Isaiah and Jeremiah still burned in His heart; and He charged His apostles, when sending them forth to evangelize the world, to begin at Jerusalem.[20] If this did not settle the question, the nature of the case would demonstrate that the preacher's vocation includes a message to the community as well as to the individual. It will be conceded by all that the preacher exists for the promotion of righteousness and the diminution of sin in the world. But sin is not only lodged in the heart of the individual: it is embodied also in evil customs and unjust laws, for which the community is responsible. The individual is largely moulded by his environment; but this may either be so favourable to goodness that his evil tendencies are restrained and everything encourages him to do well, or so evil that the worst vices are easily contracted, while every step in the right direction meets with a storm of opposition. No one would contend that the chances of a soul are the same whether it lives among those who watch carefully over its development and guide its footsteps in the paths of peace, or among those whose word and example are encouragements to every kind of sin. Society ought to be a kindly matrix in which incipient life is nurtured into health and beauty; but it may be a malignant nurse, by whom the stream of life is poisoned at its very source. If this be so, then it is as reprehensible in those whose vocation is to watch over the moral and spiritual development of their fellow-men to be indifferent to the conditions by which life is surrounded as it would be discreditable to the physicians of a city swept year after year by pestilence, if they took no interest in the insanitary conditions to which the epidemic was due, but lazily contented themselves with curing their own patients.