For in much wisdom is much grief, and he who increases knowledge increases suffering.
And He said to man, ‘See, the fear of יהוה, that is wisdom, and to turn from evil is understanding.’ ”
Do not be overrighteous, neither be overwise – why destroy yourself?
For all his days are sufferings, and his work grievous; even in the night his heart takes no rest. That too is futile.
And I said in my heart, “As the event of the fool, even so it befalls me, and why was I then more wise?” Then I said in my heart, “This also is futile.”