Actually you are probably confusing 'theology' with people called to do an immediate mission for God.  Just for your information "nuns" are not uneducated.  Back in the days when many men couldn't read or write, the Benedictine nuns certainly could do both well.  Often the abbesses of the Benedictines WAS from the nobility or even royal class---and could often read and write in a number of languages---including Latin.

Also there were those who were great spiritual leaders, often called mystics, who were sometimes theologians, but not always.  People like Catherine of Siena [also a theologian], Julian of Norwich, Hildegard of Bingen, Teresa of Avila [Theologian],  Therese of the Andes and many others---were selected by God and were educated.  This is not to say that theologians are not chosen by God as well to TEACH [the Doctors of the Church fall into this category].  God is free to select the poor and uneducated, children, women, and men to shine with the Light of the Holy Spirit.