"Since knowledge is but sorrow's spy, It is not safe to know"

This quote by William Davenant suggests that understanding can be a double-edged sword. On one hand, knowledge can be a source of joy and enlightenment, however on the other, it can also be a source of sadness and discomfort. The quote implies that understanding can be a dangerous thing, as it can result in a higher understanding of the world and its problems, which can be tough to bear. It recommends that it is much better to remain ignorant of certain things, as understanding can be a concern and can result in sadness. The quote suggests that understanding can be a source of suffering, and that it is better to remain in the dark about specific matters. It is an alerting to be careful with what we choose to understand, as knowledge can be a source of discomfort and sadness.