Good quote. You need to contemplate dependent on what does feeling arise, dependent on what fabrications arise etc.And what is the development of concentration that, when developed & pursued, leads to the ending of the effluents? There is the case where a monk remains focused on arising & falling away with reference to the five clinging-aggregates: 'Such is form, such its origination, such its passing away. Such is feeling, such its origination, such its passing away. Such is perception, such its origination, such its passing away. Such are fabrications, such their origination, such their passing away. Such is consciousness, such its origination, such its disappearance.' This is the development of concentration that, when developed & pursued, leads to the ending of the effluents. AN 4.41
Do you see this quote saying "just observe feeling. Just observe perception. Just observe fabrications etc. and wait and wait and wait for insight to arise while doing zero contemplation"
And, as I said, what one should do first is the 1step of the noble eighfold path. Witch is stream entry. Ending of effluents (enlightenment) should be aimed at only after attaining stream entry.