On April 4, 1967, exactly one year before his assassination, the Rev. Dr. Martin Luther King Jr. stepped up to the lectern at the Riverside Church in Manhattan. The United States had been in active combat in Vietnam for two years and tens of thousands of people had been killed, including some 10,000 American troops. The political establishment — from left to right — backed the war, and more than 400,000 American service members were in Vietnam, their lives on the line.

Many of King’s strongest allies urged him to remain silent about the war or at least to soft-pedal any criticism. They knew that if he told the whole truth about the unjust and disastrous war he would be falsely labeled a Communist, suffer retaliation and severe backlash, alienate supporters and threaten the fragile progress of the civil rights movement.

King rejected all the well-meaning advice and said, “I come to this magnificent house of worship tonight because my conscience leaves me no other choice.” Quoting a statement by the Clergy and Laymen Concerned About Vietnam, he said, “A time comes when silence is betrayal” and added, “that time has come for us in relation to Vietnam.”

It was a lonely, moral stance. And it cost him. But it set an example of what is required of us if we are to honor our deepest values in times of crisis, even when silence would better serve our personal interests or the communities and causes we hold most dear. It’s what I think about when I go over the excuses and rationalizations that have kept me largely silent on one of the great moral challenges of our time: the crisis in Israel-Palestine.

I have not been alone. Until very recently, the entire Congress has remained mostly silent on the human rights nightmare that has unfolded in the occupied territories. Our elected representatives, who operate in a political environment where Israel’s political lobby holds well-documented power, have consistently minimized and deflected criticism of the State of Israel, even as it has grown more emboldened in its occupation of Palestinian territory and adopted some practices reminiscent of apartheid in South Africa and Jim Crow segregation in the United States.

Many civil rights activists and organizations have remained silent as well, not because they lack concern or sympathy for the Palestinian people, but because they fear loss of funding from foundations, and false charges of anti-Semitism. They worry, as I once did, that their important social justice work will be compromised or discredited by smear campaigns.

Similarly, many students are fearful of expressing support for Palestinian rights because of the McCarthyite tactics of secret organizations like Canary Mission, which blacklists those who publicly dare to support boycotts against Israel, jeopardizing their employment prospects and future careers.

Reading King’s speech at Riverside more than 50 years later, I am left with little doubt that his teachings and message require us to speak out passionately against the human rights crisis in Israel-Palestine, despite the risks and despite the complexity of the issues. King argued, when speaking of Vietnam, that even “when the issues at hand seem as perplexing as they often do in the case of this dreadful conflict,” we must not be mesmerized by uncertainty. “We must speak with all the humility that is appropriate to our limited vision, but we must speak.”

And so, if we are to honor King’s message and not merely the man, we must condemn Israel’s actions: unrelenting violations of international law, continued occupation of the West Bank, East Jerusalem, and Gaza, home demolitions and land confiscations. We must cry out at the treatment of Palestinians at checkpoints, the routine searches of their homes and restrictions on their movements, and the severely limited access to decent housing, schools, food, hospitals and water that many of them face.

We must not tolerate Israel’s refusal even to discuss the right of Palestinian refugees to return to their homes, as prescribed by United Nations resolutions, and we ought to question the U.S. government funds that have supported multiple hostilities and thousands of civilian casualties in Gaza, as well as the $38 billion the U.S. government has pledged in military support to Israel.

And finally, we must, with as much courage and conviction as we can muster, speak out against the system of legal discrimination that exists inside Israel, a system complete with, according to Adalah, the Legal Center for Arab Minority Rights in Israel, more than 50 laws that discriminate against Palestinians — such as the new nation-state law that says explicitly that only Jewish Israelis have the right of self-determination in Israel, ignoring the rights of the Arab minority that makes up 21 percent of the population.

Of course, there will be those who say that we can’t know for sure what King would do or think regarding Israel-Palestine today. That is true. The evidence regarding King’s views on Israel is complicated and contradictory.

Although the Student Nonviolent Coordinating Committee denouncedIsrael’s actions against Palestinians, King found himself conflicted. Like many black leaders of the time, he recognized European Jewry as a persecuted, oppressed and homeless people striving to build a nation of their own, and he wanted to show solidarity with the Jewish community, which had been a critically important ally in the civil rights movement.

Ultimately, King canceled a pilgrimage to Israel in 1967 after Israel captured the West Bank. During a phone call about the visit with his advisers, he said, “I just think that if I go, the Arab world, and of course Africa and Asia for that matter, would interpret this as endorsing everything that Israel has done, and I do have questions of doubt.”

He continued to support Israel’s right to exist but also said on national television that it would be necessary for Israel to return parts of its conquered territory to achieve true peace and security and to avoid exacerbating the conflict. There was no way King could publicly reconcile his commitment to nonviolence and justice for all people, everywhere, with what had transpired after the 1967 war.

Today, we can only speculate about where King would stand. Yet I find myself in agreement with the historian Robin D.G. Kelley, who concluded that, if King had the opportunity to study the current situation in the same way he had studied Vietnam, “his unequivocal opposition to violence, colonialism, racism and militarism would have made him an incisive critic of Israel’s current policies.”