Former President Jimmy Carter said this morning that he’s “ready for anything” as he gets set to begin radiation for melanoma on his brain.

Carter explained that he initially thought the cancer was confined to his liver, but he then learned that he had four spots on his brain. He will begin radiation this afternoon.

The 90-year-old former president said he was “surprisingly at ease” to learn of the diagnosis.

“I do have deep religious faith which I’m very grateful for … I’m ready for anything,” he said.

Carter called his wife, Rosalynn, “the pinnacle of [his] life,” and he said that marrying his wife of 69 years was the best thing he ever did.

"Everything has been a blessing for me,” he said. “So I'm thankful and hopeful."

The Associated Press reported:

The center announced Carter had a small mass removed from his liver Aug. 3. Nine days later, Carter said that surgery revealed the cancer.

Carter was the nation's 39th president, advancing as a virtual unknown on the national stage to defeat President Gerald Ford in 1976. But several foreign policy crises, in particular the Iran hostage crisis, crushed his bid for re-election and Ronald Reagan swept into the

The native of tiny Plains, Georgia, rebuilt his career as a humanitarian guiding the center focused on global issues, including health care and democracy. Carter earned a Nobel Peace Prize in 2002, helped defuse nuclear tensions in the Koreas and helped avert a U.S. invasion of Haiti.

He and his wife, Rosalynn, still make regular appearances at events in Atlanta and travel overseas. When the couple is in Plains, Carter frequently teaches a Sunday School class before services at Maranatha Baptist Church. He plans to teach this weekend as scheduled, according to the church.