Ignorance is mere privation by which nothing can be produced: it is a vacuity in which the soul sits motionless and torpid for want of attraction: and, without knowing why, we always rejoice when we learn, and grieve when we forget.
To grieve for evils is often wrong; but it is much more wrong to grieve without them. All sorrow that lasts longer than its cause is morbid, and should be shaken off as an attack of melancholy, as the forerunner of a greater evil than poverty or pain.