Jesus said, “What is the Kingdom of God like? To what can I compare it?
It is like a mustard seed that a person took and planted in the garden. When it was fully grown, it became a large bush and 'the birds of the sky dwelt in its branches.'"
Again he said, "To what shall I compare the kingdom of God?
It is like yeast that a woman took and mixed in with three measures of wheat flour until the whole batch of dough was leavened."

Gospel commentary

Blessed Charles de Foucauld (1858-1916), hermit and missionary in the Sahara
§ 190, Psalm 95 (Meditations on the Psalms, pub. New City press, 2002)

How good you are, O my God, to call all nations to salvation. (…) And not just all the nations in general through your apostles and their successors, but each person individually and at every moment through the unceasing action of your grace! And not just to salvation and to heaven but to the "first place" in heaven, for you are always "knocking at the door of each soul" by your grace, and it depends on every soul, by accepting a grace at whatever moment, in staying faithful to it, to receive immediately afterwards an even greater grace and thus to see grace grow, increasing in it moment by moment, and soon taking on immense developments if it is faithful in constantly receiving it.

Let us remain faithful to grace with constancy, from no matter which point of our life, and in a short while it will become in us like the mustard seed, a tree in which the birds of heaven come to rest which, through the communion of saints, by the application of their merits, the power of their prayers and examples, will bring great glory to God, not only through himself but while helping towards the sanctification of many others! Oh! my God! what a destiny you make of us for all! Every soul may become a sun, a great tree, "the first in the kingdom of God"; every soul can receive torrents of grace. You unendingly offer all this to each of us: for this it is enough to be constantly faithful to grace from no matter which moment of our life. Oh may the present moment be that blessed instant for me!