Love each other or die.
When you learn how to die, you learn how to live.
Make peace. You must make peace with yourself and everyone around you.
You can't substitute material things for love or for gentleness or for tenderness or for a sense of companionship.
Forgive yourself before you die. Then forgive others.
So many people walk around with a meaningless life. They seem half-asleep, even when they're busy doing things they think are important. This is because they're chasing the wrong things. The way you get meaning into your life is to devote yourself to loving others, devote yourself to your community around you, and devote yourself to creating something that gives you purpose and meaning.
Aging is not just decay...It's growth.
At Brandeis, he taught classes about social psychology, mental illness and health, group process. They were light on what you'd now call "career skills" and heavy on "personal development.