This work is a volume in the Stonyhurst Philosophical Series. The chief end of this work is practical. There is urgent need at the present moment for a reasoned defense of the principles of theism. Contents: Existence of God: scope and importance of natural theology; demonstrability of God's existence; proofs of God's existence, metaphysical, physical and moral arguments; ontological argument; Kant's criticism and his alternative argument; Nature and Attributes of God: agnostic difficulties and the principle of their solution; divine essence; attributes relating to the divine nature; divine intellect; God's will and his beatitude; divine omnipotence; God in His Relation to the World: creation; rival theories considered; conservation and concurrence; providence and the problem of evil.