Mandela says "Education is the most powerful weapon which you can use to change the world." This means that the world has a number of challenges that it faces that require a number of tools to address them, Among these tools, Mandela singled out Education as the most powerful tool. Individuals, families and nations who neglect investment education of themselves, families and citizens are doing them a great disservice as they will only breed a nation of ignorant talkers and doers who will make the world worse than it is. Change in our communities, nations and the world is necessary. Just look at the many unwise decisions that those that do not have knowledge, skills and values that education gives and you begin to see why education is very important.
Secondly, in looking at Mandela's quotation from a different perspective. Education is not the most powerful weapon that can be used to change the world. The gospel of Christ is. No wonder the apostle Paul would say he was not ashamed of the Gospel for it the power of God for salvation for sinners (1 Timothy 3:16). Having an educated person alone without the influence of the Gospel only creates an educated sinner who though she or he may make some changes to the world, cannot make lasting change to the world. Men need to be educated alright but they also need the transforming power of salvation from sin brought about by the gospel. So then I would rephrase the words to read: "Education is the one of the powerful weapons which you can use to change the world, but the Gospel is the most powerful weapon you can use to change the world".