Lewis presents a famous trilemma: given what Jesus claimed about Himself, He must either be telling the truth (Lord), lying (Liar), or deluded (Lunatic). He argues that the only reasonable choice is to accept Him as Lord.

Jesus Is Either Lord, Liar, or Lunatic

True Christian living is marked by virtues like humility, charity, chastity, and patience. Lewis emphasizes that virtue is not just about doing good things, but becoming a good person.

Christian Behavior Centers on Virtue

Lewis sees faith as trust in God, and emphasizes that genuine faith naturally leads to moral actions. One without the other is incomplete.

Faith and Works Go Hand in Hand

Of all sins, Lewis calls pride the most dangerous, as it sets people in direct opposition to God. True humility is key to Christian growth.

Pride Is the Great Sin

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Lewis affirms the sanctity and permanence of marriage, arguing it’s not just a social contract but a spiritual union.

Christian Marriage Is a Lifelong Commitment

Lewis focuses on “mere Christianity”—the core beliefs shared by most Christian traditions—rather than denominational differences.

Christianity Transcends Denominations

Lewis argues that all humans have an innate sense of right and wrong—a “moral law”—which suggests the existence of a higher power or God who instilled that law in us.

Moral Law Points to a Moral Lawgiver

True Christianity means giving up the self-centered life and allowing God to remake us completely. It’s not just about rules, but relationship and transformation.

The Christian Life Is About Surrender

Christianity isn’t just about being “nice” but about transformation—becoming new creatures through the work of the Holy Spirit.

God Desires to Make Us Like Christ

He proposes that Christianity uniquely explains why we feel we ought to behave a certain way, and why we often fail to do so.

Christianity Makes Sense of Our Moral Experience

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Sharp and clear introduction to Christianity.

In the classic Mere Christianity, C.S. Lewis, the most important writer of the 20th century, explores the common ground upon which all of those of Christian faith stand together. Bringing together Lewis’ legendary broadcast talks during World War Two from his three previous books The Case for Christianity, Christian Behavior, and Beyond Personality, Mere Christianity provides an unequaled opportunity for believers and nonbelievers alike to hear this powerful apologetic for the Christian faith.

God Desires to Make Us Like Christ

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