'Abdu'l-Bahá's exhortation on China was published in the Star of the West on the 28th of April, 1917. "China, China, China, China-ward the Cause of Baha'o'llah must march! Where is that holy, sanctified Bahai to become the teacher of China! China has most great capability. The Chinese people are most simple-hearted and truth-seeking." and "China is the country of the future."
[SotW_Vol-01 (Mar 1910)-Vol-10 (Mar 1919) p2127/2922]
See as well PG99-100 for His Tablet to Chen Ting Mo.