When it comes to things that bring you joy, serve a purpose, or that you love dearly, remind yourself what they really are. Start with small things: if you have a favorite cup, remember that it's just a cup you happen to like. That way, if it breaks, you can handle it. If you hug your child or your spouse, remember that you're hugging someone who will die someday. That way, if they die, you can bear it.
With regard to whatever objects either delight the mind or contribute to use or are tenderly beloved, remind yourself of what nature they are, beginning with the merest trifles: if you have a favorite cup, that it is but a cup of which you are fond of—for thus, if it is broken, you can bear it; if you embrace your child or your wife, that you embrace a mortal—and thus, if either of them dies, you can bear it.