Patience is not just the ability to wait, but how we behave while we wait.
Behavior is a very important factor or energy that determines if your patience will be maintained.
Therefore, our ability to tolerate difficulties, delays, annoyance without getting upset, will determine if truly we can be patient.
I'm quoting the 3 lines from OP. This is very true and I like it very much as well.
Patience is indeed tied to the each persons behavior - and his
Reaction to external stimuli as well.