In design, where meaning is often controversially subjective or painfully inscrutable, few things are more apparent and lucid than the presence of passion. This is true whether the design of a product delights you or leaves you cold; in either case it's difficult not to detect the emotional investment of the hands that built it.
Enthusiasm manifests itself readily of course, but indifference is equally indelible. If your commitment doesn't encompass a genuine passion for the work at hand, it becomes a void that is almost impossible to conceal, no matter how elaborately or attractively designed it is.
i recently shared this Khoi Vinh quote with a young man who works for me that has been in a bit of a funk recently. i told him that this was something i read every morning before starting work to remind myself of the import of my daily effort. i then added that as i've gotten older i've discovered that a lot of design and technology theory seems to be fully relevant to our personal lives too (and near-surely any industry you can imagine). i find the above example to be abundantly and beautifully evident of this observation.