Even miracles need witnesses.
Yes, there is pretty much nothing in our existence that doesn’t rely, in some form, on something else for its existence and meaning. The only exception to this is that G-d is not reliant on other things, but as stated in an earlier post, G-d nevertheless appears to “choose” to take an active interest in his creation. The point of this aphorism is that we should not iconize any aspect of this physical world: even the most profound human experiences have dependencies and limits, without which their meaning and importance would be highly questionable. The interdependence of all things is what connects us—both on a practical and more “spiritual” level. Therefore, there is no one and nothing that exists in a vacuum, is too removed from our experience to escape scrutiny, or is not worthy of our attempt to understand and appreciate it. Here is one example of a situation in which this aphorism might be used:
Person 1: “Doctor, my life is perfect—no money problems, no deep emotional entanglements, no health issues, no existential angst. Problem is, I can’t shake this feeling of loneliness.”
Person 2: “Well, it’s all well and good that your life is going so well, but even miracles need witnesses…”