This collection of messages contains precious light for the children of God, especially new believers. By studying these truths, we will receive not only a foundation in the Word of God but also much help in knowing the Bible. The purpose of these crucial truths is to make the matters of the Lord’s salvation clear to those who lack an understanding of their salvation. Furthermore, they lay a foundation in the various aspects of fundamental biblical truths for believers who are clear about their salvation. The purpose is specific, but the messages are diverse.

These crucial truths were studied by Witness Lee with believers in Taiwan and were originally published in Chinese. Volume 2 contains chapters 17 through 26, which cover ten specific matters that a believer should practice after his salvation.