This quote is saying that the core idea behind non-violence is the idea of love. Non-violence means avoiding violence and physical force and instead trying to resolve conflicts through peaceful means, like negotiation and dialogue. This idea of non-violence necessitates the need to take an approach that can bring about a resolution without violence, and this approach is to use love. Love means treating others with respect, understanding, and kindness, to understand their point of view, and trying to reach a mutual agreement. When using this approach, it is less likely that violence will erupt as there is an attempt to build mutual understanding and respect.