The secret of my heart is not revealed to anyone; I am a river that has no shore.

The poet speaks of an inner world so vast and fathomless that its secrets can never be fully laid bare to the outside world. By comparing themselves to a river without any shores, they capture the boundless, untamable nature of their love, grief, and longing. It is a poignant reminder that some human emotions are simply too deep to ever be measured or confined within ordinary limits.