"Ultimately, all human activities have as their goal the realization of happiness. Why, then, have we ended up producing the opposite result? Could the underlying cause be our failure to correctly understand the true nature of happiness?"

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All of history is moving toward one great goal, the white-hot worship of God and His Son among all the peoples of the earth. Missions is not that goal. It is the means. And for that reason it is the second greatest human activity in the world.

— John Piper