If you'd like, take a moment to compare your results with the actual text from Singer's book.

1. Reason's capacity to take us where we did not expect to go could lead to a curious diversion from what one might expect to be the straight line of evolution. 2. We have evolved a capacity to reason because it helps us to survive and reproduce. 3. But if reason is an escalator, then although the first part of the journey may help us to survive and reproduce, we may go further than we needed to go for this purpose alone. 4. We may even end up somewhere that creates tension with other aspects of our nature. 5. In this respect, there may after all be some validity in Kant's picture of tension between our capacity to reason, and what it may lead us to see as the right thing to do, and our more basic desires. 6. We can live with contradictions only up to a point (p. 269).

From Singer, P. (1995). How are we to live? Ethics in an age of self-interest. Amherst, NY: Prometheus.