The concept that most resonated with me was, "to spirit your way through a problem and not spirit your way around a problem." In other words, it's okay to be human. Even though you know things like "everything happens for a reason" and "everything is the way it's supposed to be," it's okay to feel your human feelings. Go through the pain, grief or whatever. Let your spiritual beliefs help you THROUGH these feelings. Don't "use" your spiritual beliefs to go around your feelings. Even though we're working on evolving and enlightenment, we're still human. If we don't allow ourselves to feel our feelings, we set ourselves up for future problems either physically, mentally, spiritually or emotionally.
I guess I needed to hear that, so I'm assuming some of you may need to hear it too. It's like if I really believe in the things I say I believe in, why am I feeling grief, pain, depression or whatever I may be feeling? The answer is simple... I'm human. And I'm okay with that.