Answer:
"Those who deny freedom to others deserve it not for themselves." - Abraham Lincoln
This means that if you deny freedom to another, you yourself can't have it.
"You may choose to look the other way but you can never say again that you did not know." - William Wilberforce
Honestly, I'm a little confused on this too but I think it means that when you know or see something, you can't run from the fact you do or did.
"You can't hold a man down without staying down with him." - Booker T. Washington.
This is a quote Booker T. Washington made about Respect. If you think about it, it kind of opens a new door on what the quote might mean.
I think it means to push another down, you need to push yourself down as well. You can't keep them down and walk above them, as all people are equal.
I hope this helped! Have a great week.