If you've ever watched the interviews at the end of a NASCAR race, you'll find those who ended up in second, third and fourth aren't usually satisfied with their finish. They weren't racing to finish second; they were racing to finish first. The problem is that out of 42 drivers, only one can finish first. There aren't two first place trophies. There's only one. There aren't two victory lanes. There's only one. Only one driver will get first place.
The same thing is true in life. Only one can be first. In Matthew 6:24 Christ says, "No one can serve two masters. Either he will hate one and love the other, or he will be devoted to one and despise the other. You cannot serve both God and money." We cannot have a second first place thing in our lives. Only God — or something else — can be first, not both.