Strength in love isn't visible in the good years. It shows up in the week in the hospital corridor, one of you asleep upright in a chair, the other unable to do anything useful.
Powerful is a word people reach for at the beginning, about the first months and the intensity of them. That force is largely chemical and it is temporary. The kind that carries weight is slower and much less exciting to describe.
You mostly find out how strong it is afterwards, when you notice the thing did not break under a load you would have bet against.
It has been tested more than you give it credit for.