This quote is a commentary on human nature and morality. It suggests that evil, represented by Satan, does not need to pay anyone to do its bidding because there are plenty of people who are willing to do wrong of their own volition. On the other hand, good, represented by the Opposition, has to employ a large number of people to counteract this. In other words, Twain is suggesting that people are naturally inclined towards wrongdoing and it takes a concerted effort to do good.

Applying this quote to today’s world, we can see that there are plenty of examples of people doing wrong without any apparent external motivation. Corruption, crime, and unethical behavior are prevalent in many societies. This quote suggests that these actions are not the result of outside influences, but rather they come from within the individual.

In terms of personal development, this quote could be interpreted as a call to action. It suggests that doing good is not the default state, but something that requires effort and intention. It could inspire individuals to actively seek out opportunities to do good and to resist the natural inclination towards selfish or harmful behavior. It serves as a reminder that each person has a role to play in countering the evil in the world, and that this is not a passive process, but something that requires active participation.