how does dr. king react to accusations that his actons were "unwise and untimely"?

Dr. King says that Black Americans have waited too long for equality. He asks that if they do not stand up now, then when?

I guess it is easy for those who have never felt the stinging darts of segregation to say wait. But when you have seen vicious mobs lynch your mothers and fathers at will and drown your sisters and brothers at whim;....