First of all, Paul wasn't giving a command to be content. It was not meant as "instruction." He was making a statement about his own life and how he had found that he was content - or at peace with himself and God no matter what life threw his way. It seems in this part of this short book he is expressing gratitude to the Philippian church for once again having compassion on his needs and offering help. He said it nicely but in verse 10 he basically ( in my loose interpretation) says - you ignored me for awhile but found a way to help me once again. How easy it can be for the caregiver to feel ignored.
We do not fit into society's perfect mold and therefore the world around us goes on as we sit watching. Paul is like - you cared for me for awhile, didn't help me at all, and now you are once again offering help. He is grateful - not bitter. How easy it can be to become bitter at life if we are not careful. Contentment is not the enemy. We have to find a peace in God in order to deal with the dealings of daily life. We don't look or live like the rest of the world and they do not know what to do with us...we must find our contentment and our peace in Him regardless of whether there is anyone around to help us or not.
I think this is what Paul is saying. He states that he had learned to just be content with what he had each day whether that was much or little. He said I have found the secret of living in each situation... That's what can be such a struggle for the caregiver - learning to live in the situation.
This is my meditation for today - that I will live in Him - and in the situation I will find life no matter what struggles or difficulties may present themselves today. I'll live in Him today! Will you join me?