I’ll go first: “You have to have children when you’re young,” told to me when I was in my late 20s, with no desire to ever have kids, and no means to support them, by someone divorced multiple times with at least one adult child who does not speak to them.
Also: Responding to “How do I deal with this problem?” questions with “Oh, don’t worry about it, it’s enough that you’re even thinking about it!”
Meditation is better advice. By which I mean doing the exercises to approach grounding oneself in the present, sensing and feeling things from that perspective, instead of the YESTERDAY and TOMORROW clashing storms inside our minds.
But one can’t just start meditating one day - “from zero to sixty”, so to speak - and expect immediate results. It’s a discipline, like brushing your teeth every day.
This, as a general advice, is just as bad as praying unless you actually know the person.