St. Teresa of Ávila or St. Teresa of Jesus. This Spanish saint is one of the heavy weights. She received visions and was a mystical writer. Founded the Discalced Carmelite reform and was declared a Doctor of the Church. This great saint has many quotables, like the bookmark of St. Teresa:
Let nothing disturb you; Let nothing frighten you. All things are passing. God never changes. Patience obtains all things. Nothing is wanting to him who possesses God. God alone suffices.She is a patron of Spain, loss of parents, those ridiculed for their piety, against sickness, and those in need of grace.
Sancta Teresia Abulensis, ora pro nobis.