"Dead flies are what cause the oil of the ointment maker to stink, to bubble forth. So a little foolishness does to one who is precious for wisdom and glory."
(Ecclesiastes 10:1)

        Proverbs 29:20 says: Have you beheld a man hasty with his words?   There is more hope for someone stupid than for him.   Yes, sometimes we can try to do too much.   When this happens, we are in danger of losing our joy.   In these circumstances, the euphemisms "less is more", and "too much is not enough" take on more than merely intellectual significance.   The Bible principle is summed up at Jeremiah 17:5 "Cursed is the able-bodied man who puts his trust in earthling man and actually makes flesh his arm, and whose heart turns away from Jehovah himself."

Let's examine some of the reasons why we might be trying to do too much.

We might be hungry.

Like any bodily function, eating can cause us discomfort when we forget to do it.
(Matthew 24:45)

We might be deprived of sleep.

It is a principle of God's Word that "a handful of rest [is better] than a double handful of hard work."
(Ecclesiastes 4:6)

We might be tired.

We might be sick.

This includes old age.

We might be angry.

We might be seeking our own glory.

We might be seeking competitively to 'beat' others.

"They are supposing to stir up tribulation for me in my prison bonds."
(Philippians 1:17)

We might be seeking power over others.

Don't forget the scripture that asks "Will anyone hating justice control?"
(Job 34:17)

We might not recognize our own limitations.

Yes, as 1 Corinthians 8:1 puts it, "Knowledge puffs up, but love builds up."

It's not likely going to be when somebody knocks on our door and says: "Hey, slow down a little."   The last time that happened, the response was likely, "What's wrong? Can't you keep up?"   No, so when do we know then?   The answer is, succinctly, threefold:

When we don't like the people with whom we are working.

When the blood rises to our chin level.

When we don't like our own work.