There is only now, this moment. We mix our past and future when our thoughts are not present.

Our next moment and the next moment after that will always be different because our present experience will be different in the next moment. We are evolving, nothing is constant, not the air we breathe or the water we drink.

The I AM in the past is not the I AM you are now or the I AM you will be tomorrow. This is the moment, the only moment to live in.