C ... Is For Changing 
The most useless and futile effort we can make is to try to change someone else. It's not that people can't change, they can, but they will NOT make the effort and endure the discomfort it takes to change unless they can see that they will obtain some substantial benefits from changing. Simply because we want them to change is really not what most people would consider a substantial benefit. We must be aware that being intolerant and judgmental of others in our efforts to make them change does not stop there, there is 'leakage'. This intolerance and judgement will leak out onto our lives, causing low self esteem feelings for ourselves. So it is to our benefit to let other people live their own lives pretty much as they want to.
It is amazing that sometimes we will go to great lengths to convince someone to change their behavior or way of life ~ we will expend so much energy in nagging, reminding and suggesting that we hardly have any energy left to conduct our own lives. What we might not be seeing is that our behavior may be objectionable to the other person. We might be better advised to take that energy and devote it to our own life.
The exception to this is if another person's behavior is hurtful or damaging to us in some way or it takes away our freedom or rights. How other people behave is their own business ~ it is only our business if it affects us in a detrimental way.
The fact of the matter is that we are the only person we have complete control over and the only person we can change is ourselves. If another person's behavior is not tolerable to us, and if we can't adjust our behavior so there is a tolerable situation for both parties, then maybe the only thing we can do is take ourselves out of the situation. This may be the realization and opportunity we need to break free and live as we must.
The most important point of this is that if we are unhappy with what is going on in our lives, then we need to look inward to ourselves, not outward at other people. We must realize that it is not anyone else's job in life to make us happy, it is our job to make ourselves happy. We must realize that if we are unhappy, the fault lies in ourselves ~ and if we are unhappy, then we need to change.
Our happiness is totally our responsibility and the freedom of that should make our hearts sing.
Suggested Ideals/Affirmations
I let go of things beyond my control.
The only person I can change is myself.
I choose to do what I need to do, in order to be all I can be.
I am a Beloved Child of the Universe. I have all the power I need to create the circumstances I desire.
"If it's going to be, it's up to me!" (Rev. Robert Schuller)
