The Cloud of Unknowing, ed. by Evelyn Underhill, , at sacred-texts.com
The substance of all perfection is nought else but a good will; and how that all sounds and comfort and sweetness that may befall in this life be to it but as it were accidents.
AND therefore I pray thee, lean listily to this meek stirring of love in thine heart, and follow thereafter: for it will be thy guide in this life and bring thee to bliss in the tother. It is the substance of all good living, and without it no good work may be begun nor ended. It is nought else but a good and an according will unto God, and a manner of well‑pleasedness and a gladness that thou feelest in thy will of all that He doth.
Such a good will is the substance p. 229 of all perfection. All sweetness and comforts, bodily or ghostly, be to this but as it were accidents, be they never so holy; and they do but hang on this good will. Accidents I call them, for they may be had and lacked without breaking asunder of it. I mean in this life, but it is not so in the bliss of heaven; for there shall they be oned with the substance without departing, as shall the body in the which they work with the soul. So that the substance of them here is but a good ghostly will. And surely I trow that he that feeleth the perfection of this will, as it may be had here, there may no sweetness nor no comfort fall to any man in this life, that he is not as fain and as glad to lack it at God’s will, as to feel it and have it. p. 230