The Ego And His Own - pg. 17

Therefore the Sophists, with courageous sauciness, pronounce
the reassuring words, "Don't be bluffed!" and diffuse the
rationalistic doctrine, "Use your understanding, your wit,
your mind, against everything; it is by having a good and
well-drilled understanding that one gets through the world
best, provides for himself the best lot, the pleasant life."
Thus they recognize in mind man's true weapon
against the world. This is why they lay such stress on dialectic skill,
command of language, the art of disputation, etc. They
announce that mind is to be used against everything;
but they are still far removed from the holiness of the Spirit,
for whom to them it is a means, a weapon, as
trickery and defiance serve children for the same purpose;
their mind is the unbribable understanding.