"Do not ever say that the desire to "do good" by force is a good motive. Neither power-lust nor stupidity are good motives"

This quote by Ayn Rand is a caution versus using force to do good. She is claiming that the desire to use pressure to do great is not an excellent motive. She thinks that power-lust and stupidity are bad intentions either. Power-lust is the wish to have power over others, while stupidity is the lack of understanding or knowledge. Both of these intentions can cause the misuse of power and the abuse of those that are weak. Rand is cautioning against using force to do good, as it can bring about even more harm than great. She thinks that the just great intention is to do excellent out of an authentic wish to assist others, not out of a wish for power or out of lack of knowledge. Rand's message is that we must be careful when using pressure to do excellent, as it can cause more harm than good.