After fasting for days to understand a Rambam, Rav Yosef Karo finally grasped its meaning, only to hear young students explain it with ease the next day. In a dream, he was told, "When you sacrifice for Torah, you open the gates for all of Am Yisrael." Rav Shlomo Katz shares a story of holy effort and the unseen ripple effect of mesirus nefesh.