First of all it must be understood that it is the duty of all Christians – especially of those whose calling dedicates them to the spiritual life – to strive always and in every way to be united with God, their creator, lover, benefactor, and their supreme good, by Whom and for Whom they were created. This is because the center and the final purpose of the soul, which God created, must be God Himself alone, and nothing else – God whom Whom the soul has received its life and its nature, and for Whom it must eternally live.
–Saint Dimitry of Rostov (1651-1709)