What does the analogy of testing gold or a diamond signify in the context of a Guru-disciple relationship as described in the text?

In Chapter 23, the analogy of testing precious materials is used to explain why a Guru tests a disciple. Just as gold is tested in fire or a diamond endures a hammer's blows to prove its quality and gain its glory, a disciple undergoes tests to prove their faith and purity. The text notes that even though Baba knew Kaka Dixit was like 'pure gold,' the test was necessary so others would believe and have proof of his devotion. As Chapter 23 explains, people often do not believe words alone and require a demonstration. This signifies that a Guru's tests are not arbitrary but are opportunities for the disciple's divine glory to be revealed and for their faith to be solidified and recognized by all.