Apologetics

The cosmological argument from efficient causality: every contingent being requires a sufficient cause, and the causal series must terminate in one uncaused, infinite, necessary First Cause — God.

The argument from motion: whatever moves is moved by another; the series of moved movers cannot regress infinitely; therefore there exists an unmoved First Mover, pure actuality — God.

The teleological argument: the constant, universal design evident in the bodily world cannot arise from chance or from non-intelligent agents; it demands an infinite intelligent designer — God.

The moral argument: universal moral obligation demands an absolute lawgiver; the persistent misalignment of virtue and earthly happiness demands a just God and a future life.

The argument from universal human consent: belief in God is found in all peoples of all times; what all rational beings independently affirm cannot be a universal error.

God's nature as Self-Existent Being: in God alone essence and existence are identical; from this all divine attributes follow as necessary consequences.

The divine attributes deduced from God's nature as self-subsistent Being: simplicity, infinity, immutability, eternity, immensity, omniscience, freedom, omnipotence, holiness, justice, mercy, and love.

False theories of world-origin refuted — Materialism and Pantheism — and creation ex nihilo established as the only account consistent with God's infinity and the world's contingency.

Divine conservation: God continuously sustains creatures in existence from moment to moment; their dependence on the First Cause is not merely historical but ontological.

Divine providence: God's eternal plan for directing all creatures to their proper ends, extending to contingent events, free human acts, and the fact of evil in the world.

Religion defined as the moral duty-relation between creature and God; its derivation, its elements, and its division as natural and supernatural, internal and external, individual and social.

Religion is a strict moral duty binding on man both individually and socially; its universality across all peoples and times confirms what reason demands.

The true origin of religion is the rational recognition of total dependence on God; six false theories (Fear, Fraud, Law, Ghost, Social, Instinct) are examined and refuted.

Supernatural Revelation defined; its possibility established (no contradiction); its absolute and moral necessity distinguished and argued from God's plan for man's supernatural destiny.

The criteria of genuine divine Revelation — miracles and prophecies — are applied to Holy Scripture and Tradition, establishing the fact of supernatural revelation by rational historical argument.

Redemption defined; the need argued from original sin and its infinite offence against God; the fact of accomplished Redemption through the death and Resurrection of the God-Man.

The Messianic prophecies examined as historical documents; their convergence on Jesus of Nazareth in time, birthplace, lineage, character, betrayal, suffering, and resurrection.

Christ's explicit, literal claim to divine nature established from the four Gospels; the character of the claim shown to be incapable of metaphorical interpretation.

Christ's divinity evidenced by His public appearance, His universal and absolute virtues, and the unequalled sublimity and authority of His teaching.

Christ's miracles established as genuine; the Resurrection proved as certain history against the hallucination and fraud theories; mastery over life and death as proof of divinity.

Christ's prophecies of His Passion and Resurrection, Peter's denial, the destruction of Jerusalem, and the spread of the Gospel shown to be beyond natural foreknowledge.

The genuine human nature of Christ — true body and true soul — acknowledged; the Hypostatic Union of two complete natures in one divine Person explained.

The Church defined as a visible hierarchical society; its founding by Christ through the choice of the Apostles, the great commission, and the promise of perpetual presence.

The primacy of St. Peter established from the three principal Gospel texts: the conferral of the keys, the commission to confirm the brethren, and the threefold charge to feed the flock.

The four marks by which the true Church is identified: Unity, Holiness, Catholicity, and Apostolicity; each defined and explained in its apologetic function.

The three attributes of the Church's inner constitution: Authority, Infallibility, and Indefectibility; each grounded in Christ's explicit promises.

The four marks applied to the Catholic Church and shown to belong to it uniquely; other communions shown to lack at least one mark in its full sense.

The dogma extra Ecclesiam nulla salus explained; necessity of means distinguished from necessity of precept; those who sincerely believe their sect is the true Church can be members of the soul of the Church.