“This too shall pass.”
Tell yourself this often to stay level headed. Tell yourself this in good times and in bad. Make sure that you’re doing the right thing today to set yourself up for a better future tomorrow.
Just because things are good today doesn’t mean that they will remain good tomorrow. If you get lazy and don’t follow through with your duties then things will turn around for you in a way that you don’t want.
The same is true if things are bad today. It will get better, but only if you’re doing the right things to correct your situation. Don’t just give up. Losers throw their hands up in the air and give up. Winners know when to cut their losses, when to pivot, and when to try again.