Learn to keep the door shut, keep out of your mind and out of your world every element that seeks admittance with no definite helpful end in view.
Change is a constant. Anything you get attached to will one day be gone. Love the things you love as best as you can love them in the time you have in their presence. And that change, though I'm often fearful of it, has presented me with some of the greatest surprises I've ever received. I'm learning to become friends with it.