The door of Heaven is very difficult to see. Through carelessness men cannot see it. The bar of Heaven's door has cupidity for its seed. That bar is kept fastened by desire and affection. Indeed, Heaven's door is unapproachable.
स्वर्गद्वारं सुसूक्ष्मं हि नरैर्मोहान्न दृश्यते॥ स्वर्गार्गलं लोभबीजं रामगुप्तं दुरासदम्।