Everything human is pathetic. The secret source of humor itself is not joy but sorrow. There is no humor in heaven.

This quote reflects the idea that comedy and humor stem from sadness and sorrow rather than from joy and happiness. In other words, despite the fact that humans experience a variety of emotions, the emotion to producing comedy and humor is often rooted in a feeling of sadness. The quote suggests that this idea also applies to heaven, implying that there is no comedy or humor in a place which does not harbor sorrow and sadness.