In The Wealth of Nations (1776) the economist Adam Smith wrote that, when individuals pursue their own economic self-interest, the general wealth of the country increases and that general increase in prosperity benefits everyone. He described this as an "invisible hand" that guided individuals to benefit everyone even while they thought that they worked only for their own profit.
I have come to believe that there is a similar "invisible hand" in spiritual matters. When an individual acts to increase his or her own spiritual peace, the general peace of the community is increased, and so there is a benefit to all.
It's the flip side of John Donne's "any man's death diminishes me, because I am involved in mankind, and therefore never send to know for whom the bells tolls; it tolls for thee." (Meditation XVII.) Changing the negative to positive, every man's joy enriches me, and I never send to know for whom the bell peals, because it peals for me.
And so I rejoice when I learn that someone has made a life-changing or career-changing decision, even if I think that the decision might work against me. For example, if a co-worker quits, it might mean more work for me, or it might mean that I will need to help find and train a replacement. But it also might be good for me in the long run. The replacement might be someone that I can like or learn from. Upon losing an employee, our supervisors might realize that they either need to change their ways or lose more good employees. Or I might finally decide that I need to quit in order to find a better job. But how the change benefits me is unpredictable and not important. The important thing is that someone has acted to benefit his or her own life, and that action can only serve as an inspiration or model for others and only increase the prosperity of peace in the world.
And so I embrace those who have the courage to act to change their lives. I don't know how their decisions will help me, but I am sure they they will, if for no other reason that there will be happier people in the world.