Interesting question.
One of my beliefs is that I should love and care for my family to the best of my ability. So my work allows me to feed, clothe, shelter, and provide for the needs of my family,
Or you could say that my personal views are expressed by the nonprofit organizations that I choose to assist with a discounted rate or with pro bono would.
That said, I don’t think your life philosophy should be reflected in commercial art done for clients. Fine art? Sure. But our jobs as designers is to solve our client’s communication problems – not interject ourselves into the work we do for them.
They may overlap. For example, let’s say one of your life philosophies is “a place for everything and everything in it’s place” and you’re doing a website for a company that builds custom closets. Then, sure, your philosophy will be right at home. But it might not be as appropriate for that philosophy to shine through on a job where you need to reflect chaos and disorganization.