Here’s the mantra that a Course student (acim.org) created that we use all the time.

Look at the person (in front of you, in your mind, etc.) and mentally say:

You are perfect, immortal spirit, brother,
whole and innocent.
All is forgiven and released.

(Note: This is unvocalized — a mantra — versus a mantram, which is vocalized.)

We are also using this mantra, learned from Blossom’s Guides, in regular meditations:

I AM THE LIGHT.
I AM THE LOVE.
I AM.

When you use this, all our higher-order being friends join in and reify.