“Spirituality is the essential nature of our being, simply needing demonstration in outer forms. Whatever we can conceive of as human activity can be, in fact must be, spiritual. True morality is not to do with a code of values which humanity evolves to suit a certain society or a certain religious belief, but something which is intrinsic in our spirituality.”

Source: Changes

Source: "Speech By Shri Kocheril Raman Narayanan On His Assumption Of Office As President Of India"

Pierre Teilhard De Chardin, in The Phenomenon of Man [Le Phénomène Humain] (1955); Covey quotes this in Living the 7 Habits : Stories of Courage and Inspiration (2000), p. 47
Variant: We are not human beings on a spiritual journey. We are spiritual beings on a human journey.
A paraphrase of De Chardin's statement which has also become misattributed to Covey.
Misattributed
Variant: We are not human beings having a spiritual experience; we are spiritual beings having a human experience.

The Ageless Wisdom, An Introduction to Humanity's Spiritual Legacy (1996)

Section 9 : Ethical Outlook
Founding Address (1876), Life and Destiny (1913)
Context: Theologians often say that faith must come first, and that morality must be deduced from faith. We say that morality must come first, and faith, to those whose nature fits them to entertain it, will come out of the experience of a deepened moral life as its richest, choicest fruit.
Precisely because moral culture is the aim, we cannot be content merely to lift the mass of mankind above the grosser forms of evil. We must try to advance the cause of humanity by developing in ourselves, as well as in others, a higher type of manhood and womanhood than the past has known.
To aid in the evolution of a new conscience, to inject living streams of moral force into the dry veins of materialistic communities is our aim.
We seek to come into touch with the ultimate power in things, the ultimate peace in things, which yet, in any literal sense, we know well that we cannot know. We seek to become morally certain — that is, certain for moral purposes — of what is beyond the reach of demonstration. But our moral optimism must include the darkest facts that pessimism can point to, include them and transcend them.

This is attributed to Pierre Teilhard de Chardin in The Joy of Kindness (1993), by Robert J. Furey, p. 138; but it is attributed to G. I. Gurdjieff in Beyond Prophecies and Predictions: Everyone's Guide To The Coming Changes (1993) by Moira Timms, p. 62; neither cite a source. It was widely popularized by Wayne Dyer, who often quotes it in his presentations, crediting it to Chardin, as does Stephen Covey in Living the 7 Habits : Stories of Courage and Inspiration (2000), p. 47. Such statements could be considered paraphrases of Hegel's dictum that matter is spirit fallen into a state of self-otherness. Or any number of thousands of similarly vague quotes by hundreds of predecessors.
Disputed
Variant: We are not human beings on a spiritual journey. We are spiritual beings on a human journey.
Variant: We are not human beings having a spiritual experience; we are spiritual beings having a human experience.