Conversation so far:
what happened to Sri Aurobindo in 1910?
In 1910 Sri Aurobindo withdrew himself from all political activities and went into hiding. Afterwards in Pondicherry, Aurobindo dedicated himself to his spiritual and philosophical pursuits.
how did Sri Aurobindo dedicate himself to his spiritual and philosophical pursuits?
Sri Aurobindo practices four years of secluded yoga.
what did Sri Aurobindo learn from four years of secluded yoga?
In 1914, after four years of secluded yoga, Sri Aurobindo started a monthly philosophical magazine called Arya.
was the Sri Aurobindo magazine Arya successful?
The Sri Aurobindo magazine Arya ceased publication in 1921.

Question: why did it cease?
Self-contained rewrite: why did the magazine Ary ceased publication in 1921?