I recently had an opportunity to give a talk with Giovanni Troncoso covering the Church teachings on the Communion of Saints. I hope to post a summary soon. For now I leave you with St. Josemaria's words:
Through the Communion of Saints you should feel very closely united to your brothers. Defend that holy unity without fear.If you were alone, your noble ambitions would be doomed to failure. A sheep on its own is nearly always a lost sheep.
– St. Josemaria Escriva, Furrow, #615