My pastor's sermon this morning included an analogy that I thought was very insightful. The church is described in the Bible as the temple of God. If you observe the finest and most beautiful temples, you notice that they are built without mortar. Instead, the stones are shaped to fit perfectly together.
In a similar way, we believers are being formed into a "temple" for God. With Christ as our cornerstone, we are built together for God's glory. So, if you feel like you're being pounded on, chiseled, and ground down, just think of yourself as a stone being shaped to fit perfectly into the house of God.