The Avatar draws upon Himself the universal suffering, but He is sustained under the stupendous burden by His Infinite Bliss and His infinite sense of humour. The Avatar is the Axis or Pivot of the universe, the Pin of the grinding-stones of evolution, and so has a responsibility towards everyone and everything.
At each moment in time He is able to fulfill singly and together the innumerable aspects of His universal duty because His actions are in no way constrained by time and distance and the here and now of the senses. While engaged in any particular action on the gross plane He is simultaneously working on all the inner planes.
-The Everything and the Nothing, p105