I use this phrase/idea with myself all the time, and I find it helps me keep things in perspective. Usually it is about something that is honestly not that big a deal in the scheme of things, and putting it in perspective and just accepting that things worked about differently rather than stewing about it in disappointment, allows me to let some things go and move forward. Note: it is not a phrase I say to other people, but for me personally, it can help me move on.