Major Ian Thomas emphasizes the divine vocation of believers, highlighting that true fulfillment of good works can only be achieved through the power of the Holy Spirit. He warns against the futility of busy work done apart from Christ, reminding us that without Him, we can do nothing. Thomas encourages Christians to present their bodies as living sacrifices, allowing Christ to work through them in every aspect of life. He stresses that our identity and actions should be rooted in Christ, as Paul stated, 'For me to live is Christ.' Ultimately, it is our role to be available to Christ, who will do the work through us.