Advice you received but didn’t appreciate until later?

Broadly speaking what advice have you received which you at the time did not fully understand but which you later came to truly appreciate?

I’ve only later in my life come to realize that for some advice to be fully appreciated and understood you have to live through them. As in you have to learn to appreciate them by experiencing them - often by not adhering to them. I realize if I have had a more open perspective around such advice at a younger age I would have saved myself a tremendous amount of time learning from others’ experiences. Since I still have a long way to go I realize there are still plenty of such nuggets out there which I (and others here) can learn from moving forward - assuming you actually don’t need to live through them to appreciate them.