Let Nothing Disturb You

Let nothing disturb you.
Let nothing make you afraid.
All things are passing.
God alone never changes.
Patience gains all things.
If you have God you will want for nothing.
God alone suffices.
~The bookmark of Teresa of Avila

Saint Teresa of Ávila, also called Saint Teresa of Jesus, baptized as Teresa Sánchez de Cepeda y Ahumada, (March 28, 1515 – October 4, 1582) was a prominent Spanish mystic, Roman Catholic saint, Carmelite nun, and writer of the Counter Reformation, and theologian of contemplative life through mental prayer. She was a reformer of the Carmelite Order and is considered to be, along with John of the Cross, a founder of the Discalced Carmelites.

In 1622, forty years after her death, she was canonized by Pope Gregory XV, and in 1970 named a Doctor of the Church by Pope Paul VI. Her books, which include her autobiography, The Life of Teresa of Jesus, and her seminal work, El Castillo Interior (The Interior Castle), are an integral part of the Spanish Renaissance literature as well as Christian mysticism and Christian meditation practices as she entails in her other important work Camino de Perfección (The Way of Perfection).

Let nothing disturb thee,
Nothing affright thee;
All things are passing;
God never changeth;
Patient endurance
Attaineth to all things;
Who God possesseth
In nothing is wanting
Alone God sufficeth.
-Liturgy of the Hours

In Spanish, it is a song called "Nada te turbe" after the first line.

Saint Teresa, who reported visions of Jesus and Mary, was a strong believer in the power of holy water and wrote that she used it with success to repel evil and temptations.
She wrote: I know by frequent experience that there is nothing which puts the devils to flight like holy water.

Source: Wikipedia