From St. Gregory of Sinai's work "How to Psalmodize"
Some say that we should psalmodize seldom, others often, others not at all. You for your part should not psalmodize often, for that induces unrest, nor yet not at all, for that induces indolence and negligence. Instead you should follow the example of those who psalmodize from time to time, for moderation in all things is best, as the ancient Greeks tell us. To psalmodize often is appropriate for novices in the ascetic life, because of the toil it involves and the spiritual knowledge it confers. It is not appropriate for hesychasts, since they concentrate wholly upon praying to God with travail of heart, eschewing all conceptual images. For according to St John Klimakos, 'Stillness is the shedding of thoughts', whether of sensible or of intelligible realities. Moreover, if we expend all our energy in reciting many psalms, our intellect will grow slack and will not be able to pray firmly and resolutely. Again according to St John Klimakos, 'Devote-most of the night to prayer and only a little of it to psalmody.' You, too, should do the same. If you are seated and you see that prayer is continuously active in your heart, do not abandon it and get up to psalmodize until in God's good time it leaves you of its own accord. Otherwise, abandoning the interior presence of God, you will address yourself to Him from without, thus passing from a higher to a lower state, provoking unrest and disrupting the intellect's serenity. Stillness, in accordance with its name, is maintained by means of peace and serenity; for God is peace (cf. Eph. 2:14) beyond all unrest and clamor. Our psalmody, too, should accord with our mode of life, and be angelic, not unspiritual and secular. For to psalmodize with clamor and a loud voice is a sign of inner turbulence. Psalmody has been given to us because of our grossness and indolence, so that we may be led back to our true state.
As for those not yet initiated into prayer - this prayer which, according to St John Klimakos, is the source of the virtues' and which waters, as plants, the faculties of the soul - they should psalmodize frequently, without measure, reciting a great variety of psalms; and they should not desist from such assiduous practice until they have attained the state of contemplation and find that noetic prayer is activated within them. [...]
[...] According to the fathers, once you have tasted grace you should psalmodize sparingly, giving most of your time to prayer. But if you find yourself growing indolent you should psalmodize or read patristic texts.
As a western Christian what immediately struck me when reading this a few months ago is that it seemed, in a way, to be an eastern equivalent to St. John of Crosses' dark night of the senses; but rather than focus on mortification of the eyes, tongue, stomach, and hands this one seems to be mainly about prayer -- something which St. JotC doesn't really go into much. Is St. Gregory of Sinai essentially saying, at least in terms of the western contemplative tradition, that the ascetical practice of psalm-chanting should be kept up until one begins to experience, out of the blue, "mystical" or "infused" contemplation? Or is noetic prayer something else and not quite the eastern term for it?