You boast of good fortune while misfortune is yours in the shape of luck. Your good fortune is surely unstable like the tide of a river during summer.
अनिष्टे सुभगाकारे सौभाग्येन विकत्थसे। चलं हि तव सौभाग्यं नद्याः स्रोत इवोष्णगे॥