“Love all, trust a few, do wrong to none.” ~William Shakespeare
It’s OK to love all, by being respectful, and seeing the good in people, but you cannot trust everyone. Trust needs to be earned. Be very careful who you trust, so that you don’t get mistreated, and taken advantage of. This is a great boundary to have. This helps you become assertive, and effective, so that no one takes advantage of you.
Do no harm to no one, which adds fuel to the fire, and by doing harm, you are going down to a low level in life.
Remember this quote, and practice. This will help you deal with difficult people, and be your best without being emotionally unstable, and mentally stable.