Or by the meditation on anything that appeals to one as good.
In plain words: Or meditate on anything good that you love. The teacher says it can be a favorite place, view, or idea, as long as it is good and helps you focus.
This does not mean any wicked subject, but anything good that you like, any place that you like best, any scenery that you like best, any idea that you like best, anything that will concentrate the mind.
Namaste.
A calm guide to life, the mind and the old teachings.