Steve Jobs thought that a strong sense of love and passion for your work is the driving force behind producing great results. When you genuinely enjoy what you do, it becomes more than just a job; it becomes a source of inspiration and motivation, propelling you to go above and beyond in your efforts and contributions. This can be seen in every company Steve Jobs founded.
The only way to do great work is to love what you do. (video)Steve Jobs
Work consumes time, time is your greatest asset. If you do not love the work you do, you will slowly start despising your job. If you despise your job, the quality of work will not be great. The quality can be good because you have high work ethics, but it will never be great, because you will not go above and beyond in your efforts to do the job.