This quote by Rumi suggests that as one becomes more in tune with their inner self, their perception of the world becomes clearer. The "Heart" here represents the core of one’s being, the essential self that is often buried beneath layers of superficial identities and societal constructs. Living "Deeper in the Heart" means embracing this authentic self, letting go of pretenses, and cultivating inner peace and wisdom.

The "Mirror" here symbolizes our perception of the world or reality. A dirty or cloudy mirror does not reflect the world accurately, just as a mind clouded by biases, prejudices, or ignorance cannot perceive reality as it is. As we delve deeper into our hearts, shedding these impediments, the mirror gets "clearer and cleaner". This means we start seeing things more objectively, with greater clarity and understanding.

In today’s world, this quote is extremely relevant. We are often preoccupied with external appearances, social status, and material possessions, losing touch with our true selves in the process. This leads to a distorted perception of reality, causing stress, confusion, and discontentment. However, by focusing on personal growth and self-awareness, we can ‘clean’ our mirrors. This might involve practices like mindfulness, meditation, self-reflection, or simply being honest with oneself.

In terms of personal development, this quote suggests that self-awareness and authenticity are key to understanding the world and our place in it. By acknowledging and accepting our feelings, desires, and flaws, we can better understand our motivations and reactions, leading to improved decision-making and healthier relationships. Moreover, a clear mirror allows us to see others more accurately, fostering empathy and compassion. Thus, living deeper in the heart not only enriches our personal lives but also positively impacts our interactions with others.