Returning to Boston, he spoke with clearness and weight to his congregation: "I think no power of conception can do justice to the evils of slavery. They are chiefly moral, they act on the mind, and through the mind bring intense suffering to the body. As far as the human soul can be destroyed, slavery is that destroyer." Having borne his testimony, he devoted himself to the general work of his ministry. The violence of the men who had come to the front in Abolitionism was not only against his taste and feeling, but against his deep convictions; as he had written years before to Webster, he saw in these denunciations of the slave-holder seeds of a harvest of sectional hate and national disaster. A characteristic conversation with him is recorded by Rev. Samuel J. May, himself in full alliance with the Abolitionists, but a man of great sweetness and sanity, never diverted from his religious ministry or losing his mental balance. Dr. Channing dwelt on the excesses of the Abolitionists until Mr. May was aroused, and broke out: "Dr. Channing, I am tired of these complaints! The cause of suffering humanity, the cause of our oppressed, crushed, colored countrymen, has called as loudly upon others as upon us, who are known as the Abolitionists. But the others have done nothing. The wise and prudent saw the wrong, but did nothing to remove it. The priest and Levite passed by on the other side; the children of Abraham held their peace, until 'the very stones have cried out' against this tremendous wickedness. The people who have taken up the cause may lack the calmness and discretion of scholars, clergy, and statesmen,--but the scholars, clergy, and statesmen, have done nothing. We Abolitionists are just what we are,--babes and sucklings, obscure men, silly women, publicans, sinners; and we shall manage the matter we have taken in hand just as might be expected of such persons as we are. It is unbecoming in able men, who stood by and would do nothing, to complain of us because we manage this matter no better." And so the torrent of words dashed upon the silent listener, until the speaker suddenly bethought himself and stopped in abashment,--this man he was rebuking had been to him as a father in God, his kind friend from childhood, and first among the great and good. Almost overwhelmed by his own temerity, he watched the agitated face of his hearer and waited in painful suspense for the reply. At last, in a very subdued manner and in his kindest tones of voice, he said, "Brother May, I acknowledge the justice of your reproof; I have been silent too long."