From the Fathers
Of course, you need labor and effort, both mental and from the heart. Do not spare yourself. If you do, you will ruin yourself. Do not spare yourself, and you will have salvation. Abandon a certain wrongful activity that often strikes and afflicts almost everyone: That is, the fact that we spare no labor on any matter except when it comes to that of salvation. We want to think that we have only to contemplate salvation and desire it, and everything is all set. That is not how it happens in reality. The matter of salvation is the most important thing. Consequently it is the most difficult. This is by virtue of its importance and by the labor required. Labor then, for the Lord's sake! Very soon you will see the fruit. If you do not set to work, however, you will be left without anything and be unworthy. Deliver us, Lord, from this!
—St. Theophan the Recluse, The Spiritual Life and How to Be Attuned to It, Letter 51
"Theology without action (praxis) is the theology of demons."
—St. Maximos the Confessor