J.R. Miller emphasizes the importance of a Christian's disposition in reflecting the beauty of Christ to the world. He argues that our lives serve as a telescope through which others can see Jesus, and that a bad disposition can misrepresent Him. Miller insists that Christians must actively work to cultivate a sweet and gentle disposition, viewing bad dispositions as a sin that must be addressed. He encourages believers to strive for transformation through God's grace, likening the heart to a garden that requires diligent care to flourish. Ultimately, he calls for a commitment to embody Christ's love and gentleness in all interactions.