The world of the happy is quite different from that of the unhappy.
Logic takes care of itself; all we have to do is to look and see how it does it.
What can be shown, cannot be said.
There are remarks that sow and remarks that reap.
[M]an is fulfilling the purpose of existence who no longer needs to have any purpose except to live. That is to say, who is content.
If there were a verb meaning "to believe falsely," it would not have any significant first person, present indicative.