The first thought I had was that the other Mysteries--the Nativity, the Visitation, Finding Jesus in the Temple, etc.-- are gifts from Jesus to us. The Sorrowful Mysteries give us a chance to give back.
The Agony in the Garden
Joy seemed to be the key word. Christians are meant for joy, and when we are joyful, even in our trials, that makes Jesus happy. But as long as I'm focused on those buttons I mentioned, I'm distracted and can't give Jesus my full attention. I can't give Him the love he deserves. And if I'm worried about them, it means I haven't handed them over to Him. And He wants it all.
Columnist and author Teresa Tomeo said, "If God is your copilot, you need to change seats." I need (and want) to do His will, not mine, and that means taking my control freak fingers off the steering wheel.
So the mystery behind the Mystery, when applied to my problems, is to approach them with joy, and that joy comes from complete trust in Him.