I have a dream.........

"Now is the time to rise from the dark and desolate valley of segregation to the sunlit path of racial justice."

Matin wanted change, and he wanted it right then. He is saying that it is time for blacks to be seen at a whole new level. So, that they were no longer in the past (dark) , and got to rise into a new beginning ( the light ).

This was very relevant in this time. Black's were not seen as equals at the time. Also, they all strived to see a change in the justice system to see them as the same as white folk.