Baxter proposes three things in his sermon on melancholy:
1. That sorrow, even for sin, may be overmuch.Granted, overmuch sorrow for sin is not the typical malady of mankind in today's culture. However, some soft hearted Christians can easily fall into the mindset that they can "never have sorrow enough" over sin and "some think those to be the best Christians who are most in doubts, and fears and sorrows and speak almost nothing but uncomfortable complaints; but this is a great mistake." (page 3)
2. That overmuch sorrow swalloweth one up.
3. Therefore it must be resisted and assuaged by necessary comfort, both by others, and by ourselves. (Page 1)
Baxter goes on to say that there are two ways in which sorrow for sin can be overmuch.
1. The first is when it is "fed by a mistaken cause."
"If a man thinketh that somewhat is a duty, which is no duty, and then sorrow for omitting it, such sorrow is all too much... Many I have known who have been greatly troubled, because they could not bring themselves to that length or order of meditation, for which they had neither ability nor time...This one will perhaps hit close to home for some.
"And many are troubled, because in their shops and callings they think of anything but God, as if our outward business must have no thoughts." (page 3)To put it simply, if you feel bad for doing something that is not even sin, your sorrow may be overmuch and lead to excessive melancholy.
For example, a new mother who is spending one hour out of every two round the clock feeding her baby ought not to feel excessive sorrow if she is unable to pray or read the Bible regularly because she has neither the ability nor the time for lengthy spiritual disciplines. (Obviously, a new mother should not give up on quiet times altogether, but this is not the most helpful season of life to be beating oneself up about it.)
The other example is an interesting one that I'm sure my friends in the medical or professional field can relate to. It is not a sin to think about your work while you are at work. For example, a pharmacist may not have the time or the mental ability to pray, memorize scripture, etc. while she is setting about the important work of filling prescriptions. She may need to devote her entire focus on the business at hand (I hope she is, anyway, for the sake of her patients!!) Therefore, she shouldn't feel sorrow over the fact that she can't pursue spiritual disciplines at work.
2. The second way that sorrow can be overmuch is "when it hurteth and overwhelmeth nature itself, and destroyeth bodily health or understanding." By this, I think Baxter means that sorrow (even over sin) should not lead to a destruction of your physical or mental health. You can read more on this in my previous post on the disease of melancholy.