St. Teresa of Avila:​

“Many more would reach holiness if they had competent spiritual directors.”
St. Catherine of Sienna:
“The soul is in God and God in the soul, just as the fish is in the sea and the sea in the fish."
St. Cyril of Jerusalem:
“The spirit comes gently and makes himself known by his fragrance.”
Bishop Robert Morneau:​
“Spiritual direction is primarily the work of the Spirit, and the director must learn to facilitate and not obstruct the action of grace.”