There's nothing that does not grow light
through habit and familiarity,
putting up with little cares,
I'll train myself to bear with great adversity.
I chanted these lines from Shantideva daily for about four years, and still bring up them up from time to time.
Those "little cares" that arrive in our lives have the ability to muck things up greatly, if we can't meet them as they are in the moment. The pain in your back, for example, easily can lead to tension, and then irritation, and then angry acting out of some kind. So it often goes.
Many people come to Buddhism seeking relief from all of this. Seeking something they call "peace" and "calm." But how many of us really understand what peace and calm actually are?
It's easy to mistake a kind of relaxed dullness for peace and calm. Some think things like television, video games, comfort eating or drinking, and other such commonplace activities will bring them peace and calm. Others reject such notions, and try to avoid those activities all together, thinking that a certain "purity" will bring peace and calm. Of course, neither way "works."
I had a period of the latter during my early years of Zen practice. In some ways, I think the extreme of cutting out and avoiding all together many commonplace activities was helpful. A form of renunciation needed to gain clarity. However, it wasn't true renunciation, because I was still attached to "not doing" those activities. My identity of being a Zen student seemed tied to it in some ways in fact. Not eating meat. Not watching TV. Not drinking a drop of alcohol for a period. Never playing video games and similar "distractions."
Avoidance based renunciation is useful for breaking old habits, however in the end, it becomes a cage. It also ends up being a way to stall or push away the little cares of life. You can hide out in your meditation practice. Hide out in your view that you are a "good Zen student." And you can rationalize away whatever problems that arise, blaming others or dismissing them as not existing at all.
Those who are mostly lost in comforts and dullness, and those who live in ivory Zen towers, are easily thrown off balance when adversity arises. And this is often when learning to "put up" with little cares can slowly lead one to the peace and calm that is our birthright.