In his wonderful little book The Holy Longing: The Search for a Christian Spirituality, Ronald Rolheiser argues that the nonegotiable pillars of the Christian spiritual life are as follows:
private prayer and private morality
involvement within a concrete community
committment to social justice
mellowness of heart and spirit.
We all have our areas of strength and our areas of challenge; none of us is a perfectly balanced composite of all four elements. And at different times of our lives, one or another strength may rise to the forefront. But my personal observation, for what it's worth, is that the individuals I would be most likely to describe as holy, or deeply spiritual, or having encountered God in profound ways, all exude a consistent mellowness of heart and spirit ~ a sense of interior peace and open-hearted acceptance of the mystery that is God's Kingdom.
I'm just saying.
Oh, and the image is from Iona ~ photoshopped for fun.