The Zen teachings of Bodhidharma here.
The Bloodstream sermon is particularly powerful:
Buddhas don't save Buddhas. If you use your mind to look for a Buddha, you won't see the Buddha. As long as you look for a Buddha somewhere else, you'll never see that your own mind is the Buddha. Don't use a Buddha to worship a Buddha. And don't use the mind to invoke a Buddha. Buddhas don't recite sutras. Buddhas don't keep precepts. And Buddhas don't break precepts. Buddhas don't keep or break anything. Buddhas don't do good or evil. To find a Buddha, you have to see your nature.