For he has spoken, now go forth in peace.

Ferguson, Missouri (CNN) — President Barack Obama spoke with Missouri Gov. Jay Nixon on Thursday, sharing his concerns about recent violence in Ferguson after the shooting of unarmed teenager Michael Brown by a police officer.

“Now’s the time for healing, now’s the time for peace and calm on the streets of Ferguson,” Obama told reporters.

Nixon, for his part, said he would be making changes to help change the tone in the community, but he did not say what they would be. But he said it was crucial to allow protesters to express their anger so long as they respect the rights of others.

“We will not get the healing that we all need if the only response from the public is, ‘Y’all just be quiet,’ ” he said.

Nixon traveled to Ferguson to appeal for calm after a night in which heavily armed police and protesters clashed. Wednesday’s violence was the fourth straight night of unrest after Brown’s shooting Saturday.