I will not leave South Africa, nor will I surrender. Only through hardship, sacrifice and militant action can freedom be won. The struggle is my life. I will continue fighting for freedom until the end of my days.

This quote means that the speaker will not give up on the fight for freedom in South Africa, even though it will be difficult and require a lot of hard work, dedication and dedication to take action to make it happen. They will continue to fight for freedom until the end of their life, no matter what it takes.