In celebration of International Women’s Day, YouTube asked women everywhere to share what advice they’d give their younger selves if they could go back in time.

As I pondered the question, one phrase shoved all others aside, time and again.

Be kind.

Be kind to your friends, and be kind to strangers. Be kind to people you don’t like. Be kind to people having a good time around you. Be kind — even kinder — to those having rough times.

If someone’s hurting, be kind.

And while you’re at it, be kind to yourself, too.

Do kind things. Say kind words.

Be kind.