The Yoga Sutra referred to is 2.33 - vitarka-bandane pratipaksa-bhavanam. In English it means:
When disturbed by negative thoughts, opposite (positive) ones should be thought of.
In light of my husband's job loss, I've been having a hard time staying in the positive. I can feel it weighing me down physically and mentally. Dwelling in the negative only multiplies that action and result. This sutra reminds me to flip my negative thoughts and come into gratitude for things we do have to bring more positivity and energy back into our lives.