Oh, right. That links in very well with the Prosperity Gospel, doesn't it? And in fact, the "adage" isn't even an official teaching! It's complete myth, much like the "teaching" that follows:
"Just pray in the name of Jesus, much like a Buddhist or magical mantra, and you're be fully delivered from your problems."
That's not how God works...unless, of couse, He chooses to. Because EVERYTHING is according to God's will, and is in accordance with with what is needed on behalf of our salvation.
Unfortunately, our salvation OFTEN depends dearly upon our suffering, for it is our very suffering that brings us to Jesus Christ.
The very idea that the Lord does not give us "more than we can bear" defies reality and is contrary to what scripture tells us. If this were true, then there would be no suicides, there would be no mental illness, there would be no Post Traumatic Stress Disorder (PTSD) or the like. The fact that these horrible things occurr are proof that God does, in fact, give us more than we can bear.
My own mother attempted suicide, (16 years ago in the throes of bipolar agony). My mother! One of the holiest people on the planet! And yet her suffering was too much to bear so she tried to end it. She could not bear her suffering.
Indeed, she was saved, so perhaps you COULD use the Lord's intervention for the great gift of her continued life on this planet. But that certainly doesn't very well explain the successful suicides of others' parents and children.
God does indeed give us crosses which are far too heavy for us to bear, He does this knowingly, and with purpose. Walking about cheerfully and pridefully proclaiming that we can bear our load as it crushes us to death does not glorify God; it attempts to glorify US.
It's as simple as that; by this statement, we glorify ourselves. We proclaim that we are strong enough to bear anything that the Lord gives us. Are we James and John, asking that we be set at the right and left hand of God? Do we know what we are asking by so pridefully proclaiming we can drink from the cup of Christ?
We CANNOT bear it, and Jesus knows it. Only Jesus can bear the suffering sufficient to redeem the world. And while we are called to unite our sufferings to his, it does not mean that we can bear what He did.
Here is what St. Justin Martyr had to say about this topic:
"The greatest grace God can give anyone is to send a trial which cannot be born with one's own powers - and then sustain that person with His own grace so he may endure to the end and know the true source of salvation."
St. Paul himself spoke of boasting of only his weakness, for that is where God is revealed.
Make no mistake...God does indeed give us crosses we cannot carry, and He does this so that His glory will be apparent.
** 1 Corinthians 10:12 (NAB) states:
Therefore, whoever thinks he is standing secure should take care not to fall. 6
13 No trial has come to you but what is human. God is faithful and will not let you be tried beyond your strength; but with the trial he will also provide a way out, so that you may be able to bear it.
*** Other translations use varyingly terms such as "test" or "temptation". The context of this passage is in reference to SIN, not to the sufferings of life. You can see from the full passage - go read it - that St. Paul is admonishing the people to trust in God in times of temptation. This is a HUGE difference from the common idea that "trial" means "suffering". It does not.
We DO often have trials we cannot fathom, we cannot understand, and we cannot overcome. We DO, however, have the strength to overcome temptations, although often we have to go to God's own strength for we can do nothing on our own.
So while God MAY not allow us to suffer beyond our ability to bear it, our TEMPTATIONS are the point of this teaching.
I will concede that no matter how you look at this, we MUST go to God in times of temptation AND suffering, as in both cases, God's glory is revealed.