I read the April 4, 1968 diary, and posted a comment. But this is worthy of more than a comment.
You can listen to the audio of as important a speech as has ever been given in this country. "Why I Am Opposed to the War in Vietnam" or "A Time To Break Silence" - the title we give does not matter.
The contents of the message do. Here is the first part
This is part one of seven. You can read the entire text here (and that link will give you an unbroken audio, which unfortunately does not provide the ability to embed.
Peace.