There are different ways in which we can define "The Spirit." The first thing we think of is a person's soul or conscious being. That which is me, apart from my body.
But the spirit also encompasses other meanings.
The Spirit of a Revolution
The Spirit of a Conversation
Each of these other versions of the word, "Spirit," still follow the same idea of what a Spirit is. The Spirit of something involves the essence of whatever it is that thing (or person, or activity) seeks to achieve or be. It is "The Point," the Purpose, and therefore the Meaning of what it is... for.
"So my Spirit is what I am for? That sounds silly."
Not when you consider the other versions and then look back on who you are. The Spirit of a Revolution has a specific and desired outcome in mind, shared by many. So does School Spirit: the students and teachers, coaches, and band directors all chiming together with an expressed pride in who they are, what they represent. The Spirit of a Conversation carries the same meaning. It has a desired end, a purpose, a goal, that of course being what the conversation is about.
The same goes for a person's Spirit. In life, The Spirit is the application of one's conscious Self, the go-between for one's consciousness and one's body and therefore environment. It is that which carries out your intentions. To be "Spiritual" is not so much an act of religion as it is a maintenance of active and seeking awarenesses about how this "Administrator of One's Wills" interacts with his or her environment, body, self, and all things seen and unseen. It involves such things as your sense of Self, your Bearing vs. your Heading in life (where you'd like to go vs. where you're actually going), your values, beliefs, and aspirations, your goals, what you are in comparison to what's around you . To be spiritual does not always require religion, then, although religion always requires spirituality. For as we've shown in our examples of other meanings of the term,"Spirit," spirituality encompasses a more broad definition, whereas religion acts as a more formalized set of rules, procedures, and philosophies born from Spirituality and acting according to spiritual properties.
As such, to care for your Spirit is to care for who you believe your Self
to be (in comparison to how you're life currently is), to care for where you're going, what you choose to do with your time in the place where you're at, to care for how you come to know what you know, or believe what you believe. To care for your Spirit is to make sure that what you hold true about your Self matches the things you do, the places you go, the people you choose to be with, and those you choose to avoid.
The Spirit is your true essence, what it means to be You. And since Meaning is the other side of Purpose, and Purpose is what something is... for...
...then the Spirit turns out to be what you are for.