It may well be that we will have to repent in this generation. Not merely for the vitriolic words and the violent actions of the bad people, but for the appalling silence and indifference of the good people who sit around and say, “Wait on time.”

Martin Luther King, Jr. (1929-1968) American clergyman, civil rights leader, social activist, preacher

“Remaining Awake Through a Great Revolution,” sermon, National Cathedral, Washington, DC (31 Mar 1968)
    (Source)

Compare to language he used here.