We all have those days. The ones where everything seems to be shining and everything is right in the world. Sometimes they'll be during a hard time, other-times they'll pop up while life is running smoothly. But where do they come from? I've traced a pattern in my own life.
First, my relationship with God. There's a spot in Galatians 5 where Paul talks about what he calls "living by the Spirit." Essentially what he is getting at here is that when you're right with God, everything else falls in line. Not without a fight, but with a certain amount of work you can achieve a better you. The fancy Christian word for this is Sanctification. (The act of God helping us become more like him during our lifetime.) Living by the Spirit implies some type of help from God, as the Spirit's primary purpose is to help us grow and develop our gifts and thoughts to better serve God. Paul doesn't define what life by the Spirit should be like, but he does outline how people who are living by the Spirit look like. He says "The fruit of the Spirit is love, joy, peace, patience, kindness, goodness, faithfulness, gentleness, and self control." Can you imagine a time in your life where you were closest to this depiction of how we should act? For me, I am kindest, joyful, faithful, and certainly full of peace and patience on one of these "brighter days".
Second, my attitude towards others. Think about this for a second, lets say I'm having a great day. A guy cuts me off on the road, and then proceeds to flip me off. I have two options, get mad, maybe say some things I shouldn't, or ignore it. For me, if I'm already having a good day, I'm more inclined to show this guy some mercy and not get all mad over nothing. (PATIENCE) I may hold the door for someone (KINDNESS) and smile at the receptionist for an appointment (JOY.) What I'm getting at here is that when my attitude is right, and I'm the way God says I should be living, things start to fall in line, and it becomes easier to be the person I'm made to be.
When I am attempting to live life by the Spirit's guidance, I experience those "brighter days" and ultimately, peace.