I knew intellectually that saying those words helped us keep our blessings and our stressings in perspective. I didn't get the whole picture emotionally. Now, several years later, over four years as a breast cancer survivor and the same number of months as a melanoma survivor and after the death of my dad last year, I get it emotionally too. It is stressful and pointless to look too far ahead. Bad (and good) things will happen. Letting my mind race ahead to anticipate the bad stuff just ruins the right now.
I remember when I was first diagnosed with cancer. I wanted someone to magically teleport me at least five years, alive and healthy, into the future so that I could know with "certainty" that I had made it. Looking back now, I think that would have been a shame. I would have missed out on the last several years and many wonderful moments of "Right now, it is okay."