Source

Love is the source of understanding. You know intellectually that within you resides the potential, expressed or not, for all human emotion, thought and action. Yet, you no doubt meet or observe people occasionally whose life and actions are repellent or unacceptable to you. The absence of love has created a vacuum of understanding. For the meditating person, there should not be a single human being whose actions, habits, opinions or conduct lies beyond your ability to love and understand.
— Satguru Sivaya Subramuniyaswami(1927-2001), founder of Hinduism Today