“Lord Krishna is very much pleased with His devotees, even if they are not on the topmost stage of devotional service.”
This is from the Srimad-Bhagavatam 8.5.24
[This chapter of the Srimad-Bhagavatam is entitled “The Demigods Appeal to the Lord for Protection.” Included here is a genealogy of Manus—administrators of the universe—along with a narration of prayers by the demigods to the Supreme Person.]
O Maharaja Pariksit, subduer of all enemies, after Lord Brahma finished speaking to the demigods, he took them with him to the abode of the Supreme Personality of Godhead, which is beyond this material world. The Lord’s abode is on an island called Svetadvipa, which is situated in the Ocean of Milk.
Anyone who is a devotee of Lord Krishna is called a deva, and others, even though they may be devotees of demigods, are called asuras.
Ravana, for example, was a great devotee of Lord Siva, but he is described as an asura. Similarly, Hiranyakasipu is described as a great devotee of Lord Brahma, yet he was also an asura. Therefore, only the devotee of Lord Vishnu is called sura, not asura.
Lord Krishna is very much pleased with His devotees, even if they are not on the topmost stage of devotional service. Even on the lower stages of devotional service one is transcendental, and if one continues with devotional life, he continues to be a deva or sura. If one continues in this way, Krishna will always be pleased with him and will give him all instructions so that he may very easily return home, back to Godhead.