“Rasa is not a part of sadhana. Therefore if somebody says: ‘Come, I will teach you rasa’, then it will be his wickedness or foolishness. Rasa is not the subject of knowledge but of taste.
"It is not helpful for a conditioned soul to meditate upon the asta kaliya lila (the eight daily pastimes) of Sri Sri Radha Krishna because one who is unqualified will commit aparadhas".
According to Srila Bhaktivinode Thakur there are two features of Lord Caitanya's personality. Audarya and Madhurya. Preaching is Audarya (magnanimity) and Raga Marga is Madhurya (conjugal feelings). No one can relish Madhurya without Audarya.
This point is very well described in Sri Navadvip Dham Mahatmya in Chapter 18. Lord Nityananda tells Srila Jiva Goswami: "One who is qualified in madhurya-rasa worships Gauranga in the form of Radha and Krishna. As Radha and Krishna have combined in one form as my Gauranga Raya, Their pastimes do not appear to be manifest in His form. When the worship of Gauranga in dasya-rasa reaches full maturity in the heart of the living entity, madhurya-rasa naturally develops in his heart. At that time one's worship of Gaurahari qualifies him to worship Radha and Krishna in Vrindavan".
Worship of Gauranga in dasya-rasa is preaching. We are not advised to imitate Gauranga's internal feelings but we are advised to serve Him in dasya. This will qualify us for Madhurya rasa.