An ethical act is one which does not harm others' experience or expectation of happiness.
Buddha urged people to investigate things - he didn't just command them to believe.
Do not let the behavior of others destroy your inner peace.
The best way of fulfilling your own interest is to take care of others.
Our enemies provide us with a precious opportunity to practice patience and love. We should have gratitude toward them.
If there is no solution to the problem then don't waste time worrying about it. If there is a solution to the problem then don't waste time worrying about it.