The Metaphor of the silkworm

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But to return to what I was saying. The silkworm is like the soul which takes life when, through the heat which comes from the Holy Spirit, it begins to utilize the general help which God gives to us all, and to make use of the remedies which He left in His Church -- such as frequent confessions, good books and sermons, for these are the remedies for a soul dead in negligences and sins and frequently plunged into temptation. The soul begins to live and nourishes itself on this food, and on good meditations, until it is full grown -- and this is what concerns me now: the rest is of little importance.
When it is full-grown, then, as I wrote at the beginning, it starts to spin its silk and to build the house in which it is to die. This house may be understood here to mean Christ. I think I read or heard somewhere that our life is hid in Christ, or in God (for that is the same thing), or that our life is Christ.[130] (The exact form of this[131] is little to my purpose.)
Here, then, daughters, you see what we can do, with God's favour. May His Majesty Himself be our Mansion as He is in this Prayer of Union which, as it were, we ourselves spin. When I say He will be our Mansion, and we can construct it for ourselves and hide ourselves in it, I seem to be suggesting that we can subtract from God, or add to Him. But of course we cannot possibly do that! We can neither subtract from, nor add to, God, but we can subtract from, and add to, ourselves, just as these little silkworms do. And, before we have finished doing all that we can in that respect, God will take this tiny achievement of ours, which is nothing at all, unite it with His greatness and give it such worth that its reward will be the Lord Himself. And as it is He Whom it has cost the most, so His Majesty will unite our small trials with the great trials which He suffered, and make both of them into one.

 Interior Castle  - Fifth Mansion- chapter II