Ether 15:3

He began to repent of the evil which he had done; he began to remember the words which had been spoken by the mouth of all the prophets, and he saw them that they were fulfilled, thus far, every whit; and his soul mourned, and refused to be comforted.

He felt sorry for the bad things he had done. He started to remember what all the prophets had said. He saw that everything they said had come true. He was so sad that nothing could make him feel better.

He began to regret the evil he’d done. He remembered the warnings the prophets had given, and he could see they’d all come true, down to the last detail. His soul was crushed with grief. Nothing could comfort him.