I think the meaning is pretty clear here. It is that the power of virtues like humility and truth are greater than the power of empires and armies. It is saying that the people who have moral right on their side will be stronger than those with might.
The example that comes immediately to mind is not from today but from the 1940s. Then, Mahatma Gandhi was clearly humble and had truth on his side. With that, he was able to defeat the British Empire and force it to give India its independence.