Apprising Ministries is very pleased to point you to this concise but dead on target review from Dr. Gary Gilley of  , the classic book which spawned The Cult of Guru Richard Foster. Gilley says:

Written over twenty-five hears ago, and proclaimed by Christianity Today as one of the ten best books of the twentieth century, the influence of Celebration of Discipline is all but incalculable. Foster is a Quaker, so his spiritual life is grounded in the subjective “inner light” presupposition of the Friends. He is highly steeped in the Roman Catholic mystics, drawing from dozens of them for his theology. More than that, Eugene Peterson informs us that Foster has “‘found’ the spiritual disciplines [in the mystics] that the modern world stored away and forgot” (p. 206). Foster’s views are also formed by Quaker mystics and even secular thinking, most surprisingly Carl Jung, self-confessed demon-possessed psychologist.

Without question these extra-biblical sources are behind Foster’s understanding of the Christian life. That is not to say that he does not refer to Scripture and occasionally interpret it correctly. However, it is astounding to see how often he mutilates the Word of God (e.g. pp. 16, 17, 55, 83, 114, 156, 170, and 177).

As a result of his unbiblical routes and disregard for the meaning of Scripture, it should not surprise us that Foster has become a Pied Piper leading multitudes away from biblical Christianity. From the vantage point of twenty-six years since the publication of Celebration of Discipline we see just how far astray Foster has taken his followers. These include:

•Subjective leading of God as being the norm.

•Journaling and prayer as ways that God speaks to us.

•The contemplative prayer movement which has taken many to the foothills of Eastern mysticism.

•Centering prayer in which one moves to the center of God or self—an Eastern mystical practice.

•An unbiblical use of imagination which leads to occultic visualization.

•Receptivity to all the charismatic gifts including tongues, visions, revelations and prophecy.

•Use of rosaries and prayer wheels.

•Embracing of psychological views such as self-fulfillment, self-actualization, loving ourselves, mutual submission, and healing of inner wounds.

•Propagation of the Roman Catholic view of confession, penitence and spiritual directives.

•Promoting charismatic patterns of worship, including calling for the presence of God and holy laughter.

Overall Foster’s book is an encyclopedia of unbiblical teaching, which leads the unsuspecting reader away from Christ and into mysticism or worse. It is a telltale sign of the state of the church to find how accepted Foster’s teachings are.

The original review of Celebration of Discipline (CoD) by “Christian” Roshi Richard Foster appears here.

Also here’s what else Gilley had to say about CoD from his excellent series called Mysticism:

Celebration of Discipline alone, not even referencing Foster’s other writings and teachings and ministries, is a virtual encyclopedia of theological error.  We would be hard pressed to find in one so-called evangelical volume such a composite of false teaching.  These include faulty views on the subjective leading of God (pp. 10, 16-17, 18, 50, 95, 98, 108-109, 128, 139-140, 149-150, 162, 167, 182); approval of New Age teachers (see Thomas Merton below); occultic use of imagination (pp. 25-26, 40-43, 163, 198); open theism (p. 35); misunderstanding of the will of God in prayer (p. 37); promotion of visions, revelations and charismatic gifts (pp. 108, 165, 168-169, 171, 193); endorsement of rosary and prayer wheel use (p. 64); misunderstanding of the Old Testament Law for today (pp. 82, 87); mystical journaling (p. 108); embracing pop-psychology (pp. 113-120); promoting Roman Catholic practices such as use of “spiritual directors,” confession and penance (pp. 146-150, 156, 185); and affirming of aberrant charismatic practices (pp. 158-174, 198). (Online source)

See also:

WHO IS RICHARD FOSTER?

DELUSIONS OF DALLAS WILLARD

MEDITATING ON CONTEMPLATIVE/CENTERING PRAYER

CONTEMPLATING THE INNER LIGHT OF THE QUAKERS

CONTEMPLATING THE INNER LIGHT OF THE QUAKERS (PT. 2)