The dichotomy between holy and ordinary isn't one that modern lay westerners connect with so much. A better translation for "holy" to bring it alive for us today would be "it matters". So much of Zen practice is treating ordinary things as if they really mattered. It's a challenge for us as lay people to bring that attitude to what we do all day. But really that's the essence of bringing Zen practice off the cushion and into the world. The other turn of that is worrying whether we matter.