This quote is a profound exploration of identity, selfhood, and interconnectedness. When Rumi refers to "the heart," he is not speaking of the physical organ, but the essence or core of a person. This essence is not "human" in the sense of being limited to the physical body or the individual ego, nor is it "imaginary" in the sense of being a mere construct or illusion. Instead, he identifies this essence as "you," suggesting a deep, inherent connection between all beings.

The idea that the heart is not "human" or "imaginary" can be seen as a challenge to conventional notions of selfhood. It implies that our true identity transcends our physical form and our individual thoughts, emotions, and experiences. This can be interpreted as a call to recognize and honor the deeper, spiritual dimensions of our being.

The statement "I call it you" is a powerful affirmation of interconnectedness. It suggests that at our core, we are not separate, isolated entities, but expressions of a shared essence. This idea aligns with many spiritual and philosophical traditions, which emphasize the fundamental oneness of all life.

In today’s world, this quote could be applied in various ways. It could inspire us to cultivate empathy and compassion, recognizing that at a deeper level, we are all connected. It could also encourage us to look beyond surface differences and see the common humanity in everyone.

In terms of personal development, this quote could serve as a reminder to not get overly attached to our individual identities or egos. Instead, we can strive to connect with our deeper essence, and in doing so, experience a greater sense of peace, wholeness, and unity with others.