My friends, if we are going to end the suffering, we must use the same people power that vanquished injustice in Montgomery, Selma, and Birmingham.

I have seen many boycotts succeed. Dr. King showed us the way with the bus boycott, and with our first boycott, we were able to get DDT, Aldrin, and Dieldrin banned in our first contracts with grape growers.

The details in this passage send the message that

nonviolent resistance is an important tool in the fight for positive change.
nonviolent resistance is only useful in the fight for better working conditions.
people must make sacrifices if they want to make a change in society.
people must learn about other boycotts if they wants theirs to work.