Fact: the physical space that we inhabit on a daily basis, especially our homes, is an extension of our minds and attitudes. Your thoughts influence your actions, your actions influence your environment, your thoughts respond accordingly, and so on.
I don't need to offer a strong argument that the passive life—that is, the life where other people and random events have determined your course—is no life at all. Bearing that fact in mind, your surroundings shouldn't be an afterthought, but a map of the deliberate decisions you've made to make the best use of your time, energy, and resources.
I recently wrote about how you can hack your habits by deliberately organize your home; this is one specific application of that precept. The goal here is to reduce clutter, and the tool is a simple, easy-to-memorize maxim: