"In the introduction the author [St Bonaventure] describes the circumstances that gave rise to this writing: "While I meditated on the possible ascent of the mind to God, amongst other things there occurred that miracle which happened in the same place to the blessed Francis himself, namely the vision of the winged Seraph in the form of a Crucifix. While meditating upon this vision, I immediately saw that it offered me the ecstatic contemplation of Fr Francis himself as well as the way that leads to it" (cf. The Mind's Road to God, Prologue, 2, in Opere di San Bonaventura. Opuscoli Teologici / 1, Rome 1993, p. 499).
The six wings of the Seraph thus became the symbol of the six stages that lead man progressively from the knowledge of God, through the observation of the world and creatures and through the exploration of the soul itself with its faculties, to the satisfying union with the Trinity through Christ, in imitation of St Francis of Assisi.
The last words of St Bonaventure's Itinerarium, which respond to the question of how it is possible to reach this mystical communion with God, should be made to sink to the depths of the heart: "If you should wish to know how these things come about, (the mystical communion with God) question grace, not instruction; desire, not intellect; the cry of prayer, not pursuit of study; the spouse, not the teacher; God, not man; darkness, not clarity; not light, but the fire that inflames all and transports to God with fullest unction and burning affection.... Let us then... pass over into darkness; let us impose silence on cares, concupiscence, and phantasms; let us pass over with the Crucified Christ from this world to the Father, so that when the Father is shown to us we may say with Philip, 'It is enough for me''' (cf. ibid., VII 6).
Dear friends, let us accept the invitation addressed to us by St Bonaventure, the Seraphic Doctor, and learn at the school of the divine Teacher: let us listen to his word of life and truth that resonates in the depths of our soul. Let us purify our thoughts and actions so that he may dwell within us and that we may understand his divine voice which draws us towards true happiness."
- Pope Benedict XVI.
Today, 15 July, is the feast of St Bonaventure, the Seraphic Doctor, and this stained glass detail is from St Etheldreda's in London.