In life, I believe your second thought means more than your first.
For the first twenty-five years of my life, the scope of my understanding was limited to this idea that people were the constant best representation of themselves. The first words out of someone’s mouth were the most true; Freud tell us they must be! Even if you would like to recant your response, it is still what “slipped out,” and therefore must have some measure of truth too it, right?
As time went on, I soon began to understand how this idea fundamentally conflicted with the idea of an evolving and maturing person. Or at least, my interpretation of these events conflicted.
When I was a child, I used to speak like a child, think like a child, reason like a child; when I became a man, I did away with childish things.
As with any new skill or talent, “perfect practice makes perfect performance.” The only way I can improve who I am is through the constant attempt to be a better person in those moments. It starts with a simple apology, and if I am honest in my effort, I can start to catch myself before I say something from my old mindset. And maybe one day, if I am lucky, the second though becomes the first, and this road has made all the difference.
So yes, I believe the second though is the most important. Your first thought tells me who you are, while your second one tells me who you want to be. I believe it is our challenge to push that second though up closer and closer to the first until it squeezes it into oblivion.
I use to call this inner-conflict. Now I just call this growing up.