As you will note under Blogs I Follow, I subscribe to the blog of Richard Rohr at Center for Action and Contemplation (CAC).
I do so because I find him to be the most spiritually mature individual of whom I am aware. (Overall my previous mentors, listed in my most recent post, also fall into this category.)
Richard Rohr is a Catholic priest, a Franciscan monk. In 1986 he envisioned CAC as a place where opposites (action and contemplation) are held together, bridging gaps between the spiritual and the justice communities. As a priest, his language is often religious, but the underlying content of what he is writing is deeply spiritual (see my next post for what I mean by spiritual, and how I think it differs from religious).
Especially I recommend his most recent post: Unconditional and Conditional Love.