I think the second piece of life advice I would give someone would be to guard your heart—because everything else comes from this one thing.
Guarding your heart to me means to keep directing your thoughts to places of integrity, of honesty, and purity; living open and transparent. Living transparently doesn’t mean you have inappropriate boundaries. You don’t have to be a tell-all. But as you realize there are places in your heart where you store dark secrets, open those up. You can tell they are there when you stumble across something hidden that brings you shame—that you would never want anyone to know. Find someone safe to share with. If you have no one to trust, then lay it at the feet of Jesus and ask His help in letting go---and go forward.
Guarding your heart means forgiving yourself and letting go of offenses you might have towards others. It also means doing all you can to protect your choices today. When you have a choice between being honest or not, loving or not, loyal or not, faithful or not, integrous or not . . . . make the choice to protect the tenderness of your heart and keep it pliable, open, and flowing with life.
The true condition of the heart slips out in unanticipated moments. Keeping it honorable and pure, will reveal it’s nature, and allow others to trust you. Guard your heart for it speaks loudly.
Guard your heart above all else, for it determines the course of your life (Prov 4:23 NLT).
Keep your heart with all vigilance, for from it flow the springs of life (Prov 4:23 ESV).
“Do not devise evil in your hearts against one another, and love no false oath, for all thee things I hate, declares the Lord” (Zech 8:17 ESV).
For as [a man] thinks in his heart, so is he (Prov 23:7 NKJ).