Some Maximus’ writings, like The four centuries on Charity, contain several thoughts about friendship. This field of Maximus’ thinking has not yet been studied. Maximus grounds his ideal of friendship on the goodness of human nature. But, conscious of the wounds that this nature has received from sin, encourage his readers to improve their spiritual life, to become better friends. According to Maximus’ thought, friendship must evolve to charity, in wich its natural characteristics will not disappear, but will be opened to the whole humanity, and will be enriched with a stronger stability and with the capacity to forgive.