King writes that he wished "the white moderate would reject the myth concerning time in relation to the struggle for freedom" What is that myth, according to King?

The idea he is trying to get across is that the myth is that people think "time" will heal all things and will solve all things.  There are those who want the members of the movement to "chill out" and be patient while King understands that patience and non-violence is one thing while just ignoring what is happening cannot be a part of their plan.