Francis of Assisi (ca. 1181 – 1226 CE) was an Italian mystic and preacher who adopted a life of poverty and founded the Franciscan Order in the Catholic Church. Some background on his student Clare is here.

Listen, little poor ones called by the Lord,
     who have come together from many parts and provinces:
Live always in truth,
     that you may die in obedience.
Do not look at the life outside,
     for that of the Spirit is better.
I beg you through great love,
     to use with discretion
     the alms which the Lord gives you.
Those who are weighed down by sickness
     and the others who are wearied because of them,
     all of you: bear it in peace.
For you will sell this fatigue at a very high price
     and each one of you will be crowned queen
     in heaven with the Virgin Mary.

Translation Regis J. Armstrong, OFM CAP & Ignatius C. Brady, OFM