Holiness is not an accomplishment of the self, nor a fullness which one gives oneself. It is first of all an emptiness which one discovers and accepts, and which God comes to fill in the measure that the person opens himself to His fullness… To contemplate the glory of God… to discover that God is God, eternally God, beyond what we are or can be, to rejoice fully in what he is, to be in ecstasy before his eternal youth and to thank him for himself, for his unfailing mercy, that is the most profound demand of that love which the Spirit of the Lord does not cease to pour into our hearts. That’s what it is to have a pure heart.
— Francis of Assisi, as quoted in
Passing from Self to God:
A Cistercian Retreat
by Robert Thomas, OCSO