Parashat Terumah is the first of many times when the Torah describes the mishkan, the Tabernacle, and in this initial description the ark is mentioned first. This is because the central purpose of the mishkan was to be a place where God’s Law was taught and internalized. In later accounts of the mishkan, the ark is no longer mentioned before any other item. This is not because the ark has lost its importance, but rather because now we understanding that although God’s Law is primary, it is also part of an ecosystem that consists of many elements. The same is true for us: first we must know and decide what our central purpose in life is and afterward the rest of our lives be arranged around this purpose.