Ellen White's writings clearly state that the tree of knowledge of good and evil was a test for Adam and Eve, representing a pledge of their obedience, faith, and love to God. It was a constant reminder of God's ownership of all and gave them the opportunity to demonstrate their faith and trust in Him by perfect obedience to His requirements. Here is a key statement: - "This tree God reserved as a constant reminder of His ownership of all. Thus He gave them opportunity to demonstrate their faith and trust in Him by their perfect obedience to His requirements." (Testimonies for the Church, vol. 6, p. 386.1) However, while the tree is described as a test of obedience and a symbol of God's ownership, Ellen White does not explicitly state in the available books that the tree of knowledge of good and evil directly represented the tithe. The concept of tithe as a test of loyalty and recognition of God's ownership is found elsewhere in her writings, but the direct equivalence between the tree and the tithe is not made in the sources reviewed. Summary: - The tree of knowledge of good and evil was a test of obedience and a reminder of God's ownership. - Ellen White does not explicitly say in her books that the tree represented the tithe, though both are described as tests of loyalty and recognition of God's ownership. If you would like me to search other collections (such as manuscripts or compilations) for a more direct statement, please let me know. References: - White, E. G. (1901). Testimonies for the Church, vol. 6, p. 386.1. Pacific Press Publishing Association.