It is a great mitzvah to be happy always.
If you never want to see the face of hell, when you come home from work every night, dance with your kitchen towel and, if you're worried about waking up your family, take off your shoes.
Common sense is strengthened by joy.
When a man is able to take abuse with a smile, he is worthy to become a leader.
Feel no sadness because of evil thoughts: it only strengthens them.
Always help the persecuted.