Too often, professed Christians are both contented and discontented about the wrong things.
God has given His church an absolutely sufficient, living, inerrant revelation of His person, works and will. Yet rather than focus all our prayerful energy on mastering and being mastered by all of its contents, we allow a dangerously unbelieving and ungrateful discontentment to divert our attention and leave us open to harmful substitutes, as well as pastorally-disastrous schemes and mazes.
In that case, we need to re-read the book of Numbers. We need to remind ourselves just what raging death God visited on those who were constantly, repeatedly, whiningly discontented with His provisions. We need to repent of our unbelief and ingratitude. We need to revise our approach to Christian living, by joyfully embracing a robust affirmation of God's own testimony to the sufficiency of His Word.
Then on the other hand (and, as I think on it, relatedly) we are too easily contented in our relationship with God. Let me 'splain.
All of us professed Christians, if asked "Would you like to know God better?", would answer "Yes." But what if we were asked a different question? What if we were asked if we are willing to do what it takes to know God better, know His word better, be better prepared to serve Him, be more immersed in worship and service, be more fruitful and productive and effective in serving Him (see the sermons on Proverbs 3:1-12 in this series)? What if we were asked if we were willing to do what it takes to move ahead in those areas?
In that case, I'm certain that candor would force too many to reply "No thanks, I'm good."
I'm called to consider this by that arresting, alarming verse, Proverbs 1:32 —
For the turning away of the gullible will slay them,
And the complacency of the stupid will destroy them. [DJP]