Great spiritual teachings do not change, but we do. As we grow older and wiser, we can receive the teachings at deeper levels.
A failure remains a failure only if we refuse to learn from it. Any situation that teaches us greater humility, sobriety, wisdom about self and others, responsibility, forgiveness, depth of reflection, and better decision making -\-\teaching us what's truly important-\-\is not an ultimate failure. Sometimes what we deem a failure at the time it happens actually serves to foster a change within us that creates an even greater success down the road.
I believe that the truth with a capital T is at the center of all the great religious teachings.
I've never seen service as separate from my spiritual practice or my spiritual teaching.
If I say to my daughter, "Go say `hi' to Aunt Gertrude," there is a reason there. I'm teaching her manners. I think the idea that she'll say `hi' to Aunt Gertrude only if she wants to is the biggest crock of silliness I've ever heard. Yet I meet people everyday who were clearly brought up to think that if they didn't want to say "hi" to Aunt Gertrude, that was fine.
No matter what I write or speak about, it always has some connection to how our spiritual understanding impacts the world we live in. Whether I'm writing or teaching about nutrition, pilates, green living or meditation, all topics simmer down to self thought and intention.