Whitfield on Christian unity

I'm reading Iain Murray's Heroes right now, in which he gives brief biographies of several Christians. The chapter on Whitefield focuses on Christian unity. Murray gives 3 reasons why unity fails and 5 ways to increase it. This has been challenging and encouraging for me recently.

3 reasons unity fails:
1. Because fallen human nature is universally prone to prejudice, ignorance, and the adoption of wrong principles.
2. Because "church" in the sense of denominational organization is identified with the body of Christ.
3. Because if encounters constant opposition from the powers of darkness.

5 Ways to increase unity
1. Let us see other believers first as Christians
2. Let us desist, as far as possible, from controversies on secondary issues.
3. Let us be sure to recognize our own failures in this grace.
4. Let us seek to keep the unity of heaven before us
5. Let us seek closer fellowship with our savior, Jesus Christ.