(1) They were preachers of _personal righteousness_. In {47} times of falsehood and hypocrisy they were witnesses for integrity and truth, upholding the personal virtues of justice, sincerity, and mercy against the idolatry and formalism of the priesthood. 'What doth the Lord require of thee,' said Micah, 'but to do justly, to love mercy, and to walk humbly with thy God.'[14] In the same strain Isaiah exclaimed, 'Bring no more vain oblations, but wash you and make you clean.'[15] And so also Habakkuk has affirmed in words which became the keynote of Paul's theology and the watchword of the Reformation--'The just shall live by faith.'[16] (2) They were the advocates of the _rights of man_, of equity and justice between man and man. They denounce the tyranny of kings, and the luxury of the nobles. They protest against the oppression of the poor and befriend the toilers of the cities. They proclaim the worth of man as man. They reveal Jehovah as the God of the common people, and seek to mitigate the burdens which lie upon the enslaved and down-trodden. (3) They were the apostles of _Hope_. Not only did they seek to lift their fellow-men above their present calamities, but they proclaimed a message of peace and triumph which was to be evolved out of trouble. A great promise gradually loomed on the horizon, and hope began to centre in an anointed Deliverer. The Hebrew prophets were not probably conscious of the full significance of their own predictions. Like all true poets, they uttered greater things than they knew. The prophet who most clearly outlines this truth is the second Isaiah. As he looks down the ages he sees that healing is to be brought about through suffering, the suffering of a Sinless one. Upon this mysterious figure who is to rise up in the latter days is to be laid the burden of humanity. No other, not even St. Paul himself, has grasped so clearly the great secret of atonement or given so touching a picture of the power of vicarious suffering as this unknown prophet of Israel. {48} 3. THE POETICAL BOOKS