They are wise ^^^…

Say the mantra as much as possible. Especially before bed and make sure it isn't just words, it is the thought you are carrying.

This is my own added opinion beyond the general consensus:
I think that meditating on your mantra is also a good thing. You want that mantra to be the way you live until you get better at inducing. The answer to "what are you thinking about?" Should always be your mantra.