Lately I’ve been sinking into myself again and I hate it. I wrote these on my wrists to hopefully keep from losing myself. 
Be here now is a pretty simple concept- don’t dwell on the past, don’t stress about the future. Keep your mind in the present. 
Let it go is pretty self explanatory. I dwell on things that don’t matter. I need to stop allowing my mind to keep thinking of things that inevitably lead to my unhappiness.