Question: Is there any advice for helping those with mental disabilities with the Dharma (who might have difficulties understanding or focusing)?
Answer: Be very patient with them, and remember that they too wish to have True Happiness like us, though they might not be clear-minded about this. When possible, personally chant, or play CDs of chants to soothe them, to encourage them to chant along – verbally, if not mentally. This is the simplest spiritual practice possible. It is a form of meditation.
The power of sacred chants can be remarkable. It might not be obvious straightaway, but over some time. When the mind is able to calm down, it can become clear. And when it becomes clear, wisdom arises. Short simple chants might have better effects, as they are easier to focus and repeat. ‘Namo Amituofo’ (Homage to Amitabha Buddha) – that’s a short chant! [Even shorter still is just to chant “Amituofo”.]
Taken from : Moonpointer.com