There is no adequate defense, except stupidity, against the impact of a new idea.
Strength lies not in defence but in attack
A state attacked by another which renews an old claim rarely yields it without a war: it prefers to defend its territory, as is always more honorable. But it may be advantageous to take the offensive, instead of awaiting the attack on the frontiers.
Art of War. Originally published in 1862.
Love is much like a wild rose, beautiful and calm, but willing to draw blood in its defense.