On 10 April 1981 , having discoursed daily for nearly 15 years , Rajneesh entered a three-and-a-half-year period of self-imposed public silence ; satsangs-silent sitting , with music and readings from spiritual works such as Khalil Gibran 's The Prophet or the Isha Upanishad-replaced discourses .
A situation rose when Rajneesh entered a three-and-a-half-year period of self-imposed public silence on 10 April 1981 .