It is believed that Bhaisajyaguru resides in the Eastern Pure Lapis Lazuli and serves to cure the suffering of the world, and that Amitabha is the ruler of the Western Pure Land Paradise.
薬師如来は東方浄瑠璃世界に住み、現世の苦しみを除く仏であり、阿弥陀如来は西方極楽浄土の教主である。