According to Osho, the 'sun rising in the evening' signifies embracing life's wholeness: morning and evening, birth and death, love and aloneness, peaks and valleys, with joyful yes-saying. When nothing is denied or renounced and everything is accepted in gratitude, even death glows with light. Seeing this completion makes one a Buddha: all is good, and in that total affirmation, all is experienced as God.
It means learning to say a warm yes to every side of life, so even endings and loneliness feel part of a beautiful whole.