Monastery

The Monastery of a cloistered heart is the person's own life.  A monastery is a place consecrated to God, a place of prayer, a place where God is loved and served.  Our lives can be all of these things.  Just as any building can become a monastery by being dedicated to God, so our lives can become "monasteries" by such dedication. 

This is more than a nice daydream.  It is simply truth.  

"Even now we are called to be a dwelling for the Most Holy Trinity.  'If a man loves Me,' says the Lord, 'he will keep My word, and my Father will love him, and we will come to him, and make our home with him.' (John 14:23)"  (Catechism of the Catholic Church #260)

"O my God.... grant my soul peace.  Make it Your heaven, Your beloved dwelling, and Your place of rest.  May I never abandon You there, but may I be there, whole and entire, completely vigilant in my faith, entirely adoring, and wholly given over to Your creative action."  (St. Elizabeth of the Trinity, quoted in Catechism of the Catholic Church # 260)

As imperfect as we are, Our Lord actually desires to live within us.

Imagine. 

"Humility and charity are the two main parts of the spiritual edifice.  One is the lowest and the other the highest, and all the others depend on them.  Hence, we must keep ourselves well founded in these two, because the preservation of the entire edifice depends on the foundation and the roof."  (St. Francis de Sales)