Man is influenced by thought of some kind…

Philosophy is merely thought that has been thought out. It is often a great bore. But man has no alternative, except between being influenced by thought that has been thought out and being influenced by thought that has not been thought out. The latter is what we commonly call culture and enlightenment today. But man is always influenced by thought of some kind, his own or somebody else’s; that of somebody he trusts or that of somebody he never heard of, thought at first, second or third hand; thought from exploded legends or unverified rumours; but always something with the shadow of a system of values and a reason for preference. A man does test everything by something. The question here is whether he has ever tested the test.

G. K. Chesterton, quoted by thoughtfulchristianity.net

The modernest attacks morality…

[The modernist] goes first to a political meeting where he complains that savages are treated as if they were beasts. Then he takes his hat and umbrella and goes on to a scientific meeting where he proves that they practically are beasts…. In his book on politics he attacks men for trampling on morality, and in his book on ethics he attacks morality for trampling on men.

G. K. Chesterton, quoted in Tactics by Greg Koukl, kindle location 2026

The only part of Christian theology…

The universal moral depravity of human beings is abundantly clear. G. K. Chesterton wryly referred to the doctrine of original sin as “the only part of Christian theology which can really be proved.”

G. K. Chesterton, quoted in The Battle for the Beginning by John MacArthur, p. 196