Every pastor, student, and Christian should read Grant Macaskill’s Living in Union with Christ. Macaskill lucidly argues for the importance of being in Christ for the Christian life. Any account, he avers, that does not begin with “It is no longer I who live but Christ who lives within me” (Gal 2:20) amounts to a species of legalism because it assumes that “I” (the agent) have accomplished something apart from Christ.