A devotee who really wants to attain the perfection of liberation can be satisfied with nothing that is outside of the devotional service of Lord Hari.
H H Radhanath Swami gives the example of the Cataka bird. The Cataka bird always keeps her eyes fixed on the cloud. Because she will not accept water from anywhere except that cloud. although, there maybe fresh clear rivers, lakes, and ponds with unlimited water for her to drink, she will never even look at them. She will never consider them. She will keep her eyes and her attention fixed on the cloud. Just waiting for one drop to fall and praying when will that drop come. I will not accept water from anywhere else. Sometime from that cloud there is thunder and sometimes there is lightening which causes great pain and suffering to the Cataka bird but the Cataka bird will tolerate and endure the pain and suffering inflicted by the lightening and thunder of the cloud. And with rapt attention wait for that drop of water to fall without consideration of taking that drop from anywhere else.
Radhanath Swami continues that the great rishis have told us this is the price of real enlightenment – dhrtha vrta – to have that firm conviction and faith to always be longing and hankering for the mercy of the Lord. And not to look anywhere else for our fulfillment of desires. And even if the Lord puts us in the most difficult and painful conditions, we will never give up, with faith and one-pointed determination, just wait and wait, with our eyes fixed on the lotus feet of the Lord for that drop of mercy. He may give us disease, he may give us poverty, he may give us so many heat breaks but we will never look anywhere else for the fulfillment of desires. He has the right to deal with us anyway He please. This is the only consciousness that makes us worthy to truly receive the mercy of the supreme Lord, bhagavan. Under any circumstances, to never give up, His loving service.