In tonglen practice, when we see or feel suffering, we breathe in with the notion of completely feeling it, accepting it, and owning it. Then we breathe out, radiating compassion, lovingkindness, freshness - anything that encourages relaxation and openness. So you're training in softening, rather than tightening, your heart. In this practice, it's not uncommon to find yourself blocked, because you come face to face with your own fear, resistance, or whatever your personal "stuckness" happens to be at that moment.
Pema ChodronThis genuine heart of sadness can teach us great compassion. It can humble us when we're arrogant and soften us when we are unkind.
Pema ChodronOpenness doesn’t come from resisting our fears but rather from getting to know them well.
Pema ChodronAwareness is the key. Do we see the stories that we're telling ourselves and question their validity? When we are distracted by strong emotion, do we remember that it is our path? Can we feel the emotion and breathe it into our hearts for ourselves and everyone else? If we can remember to experiment like this even occasionally, we are training as a warrior. And when we can't practice when distracted but KNOW we can't, we are still training well. Never underestimate the power of compassionately recognizing what's going on.
Pema Chodron