Srila Prabhupada Says This is a difficult question
Once Prabhupada arrived in New Mayapur when we were on traveling sankirtan, and later, when we arrived in New Mayapur, Prabhupada was giving darshan on the lawn. At the end of the darshan, Prabhupada asked for questions and I thought, "If I ask a question, my spiritual master will see me. He'll know that I'm his disciple, that I'm here." There were so many devotees that we didn't get the much intimate association. I raised my hand and said, "In your lecture, you said that because of his love, the pure devotee of Krishna sees Krishna everywhere. But in the Siksastakam prayers, Lord Chaitanya's feeling separation from Krishna and thus He's feeling a moment to be like twelve years or more. So how do we understand that on one hand the devotee is seeing the Lord everywhere but on the other, he is also feeling separation?" I was sitting close to Prabhupada, and he closed his eyes. It's a deep subject, vipralambha-bhava, feeling loving sentiments for the Lord in separation from Him. Prabhupada opened his eyes, leaned forward and only said, "This is a difficult question. Someday when you're advanced, you will understand the answer to this question."
Reference:Memories Anecdotes of a Modern Day Saint - Volume 3 by Siddhanta Dasa