I started prostrations a few months ago and so far I have done 300, but I’m having difficulties because I have osteoarthritis in both knees. Can you recommend a way for me to continue my prostrations or would it be possible for me to start with Diamond Mind?

Your refuge is in your mind, and all buddhas see you. You do your best, and you will get the full results. Please continue with the Diamond Mind meditation, that’s an excellent practice. What moves to the next life and is purified now is your mind, not your shoulders, back or knees. So everything is fine and enjoy your meditation.