Whether as advisers to kings on matters of religion, ethics and politics, or as their critics, under the primacy of the relationship between the individual and God, the prophets were guided by the need for justice and issued powerful commentaries on the morality of Jewish national life. Their revelatory experiences were recorded in books of inspired prose and poetry, many of which were incorporated into the Bible.
The enduring, universal appeal of the prophets derives from their call for a fundamental consideration of human values. Words such as those of Isaiah (1:17), "Learn to do good, devote yourselves to justice; aid the wronged, uphold the rights of the orphan; defend the cause of the widow continue to nourish humanity's pursuit of social justice."
(Source- Archive of Foreign Ministry)