In 1930 or 1931, he joined Bethel Bible School in Shanghai, where, with Andrew Gih and three other graduates, he formed a Bethel Worldwide Evangelistic Band in 1931. The topic of his sermons were now mainly about how to deal with sin. A summary of his teaching during this period was that people admitting their sins is not enough, they must “repent of their sins” and after repentance should come a time to “Correct your sins”. He went on to say that after one has changed sinful habits comes a time to “Repay your sins”.