From The Tibetan Book of Living and Dying:
"Just as the ocean has waves, or the sun has rays, so the mind's own radiance is its thoughts and emotions. The ocean has waves, yet the ocean is not particularly disturbed by them. The waves are the very nature of the ocean. Waves will rise, but where do they go back ? Back into the ocean. And where do the waves come from ? The ocean.
In the same manner, thoughts and emotions are the radiance and expression of the very nature of mind. They rise from the mind but where do they dissolve ? Back into the mind. Whatever rises do not see it as a particular problem. If you do not impulsively react, if you are only patient, it will once again settle into its essential nature."