What's the best characteristic a human being can exhibit?
You can offer "compassion" as an answer. That's a good one, to be sure.
You might suggest "loving." It hints compassion, and a host of other good behaviors.
Me, I'll go with "commitment." Because it embodies persistence, which speaks to accomplishment, and signals that a choice was made, which shows freedom. A committed person will achieve things. A committed person is loyal. If you're committed, you're in for the long haul. Unwavering. Determined.
My second nomination would be "passionate." You can be committed, but if you don't have fire in the belly, the going can be slow and painful to keep up the nerve to do what you've chosen to do.
Passionate commitment? That's someone to be reckoned with.
Where do you consistently exhibit your passionate commitment?