The phrase “a clean slate” is kicked around a lot this time of year. People are encouraging others and themselves to forget the heartache or mistakes or tragedies of last year and begin anew. A clean slate. It sounds so crisp. So freeing. So beautiful. So…clean. But I’m beginning to wonder, is a clean slate actually possible? And even if it were, is it desirable? To start anew and forget last year, as if it never happened? I walk into 2015 dragging a heavy, messy, embarrassingly dirty slate behind me, and I think I’ve been under-appreciating…