Ketachon literally means "the one who withholds".
In 2 Thessalonians 2, that word refers to the will of God that determines when and how the end times will unfold.
In the microcosm (in us), it relates to how our inner Being tries to "hold back" or slow our karma and defects so we have a chance of working on ourselves.
“Nothing is easier than self-deceit. For what each man wishes, that he also believes.” —Demosthenes
"Do not worry; cultivate the habit of being happy." —Samael Aun Weor