You have met all three conditions on a small scale. You heard about the Baha'i Faith, you decided to investigate it, and you acted on your decision. Now you need to continue your investigation until you have reached the point of certainty. That point comes when your knowledge turns into vision, when you move from the stage of 'knowing' to the stage of 'seeing.' (4:21)

Once Jesus gave this standard as a way of separating truth from falsehood: If a man chooses to do God's will, he will find out whether my teaching comes from God or whether I speak on my own. Christ (John 7:17) (4:22)

The same rule applies to Baha'u'llah's teachings. What is God's will? It is to use His standards, not our own. Two of the most essential standards our Creator asks us to use are these:

Good fruits & Fulfillment of prophecies (4:23)

Baha'u'llah fulfills both of these standards. He fulfills the second one on a scale that has never been seen before. (4:24)

References:
1,7,9. hwd (Persian) no. 36, 68, 80.
2. swb 103.
3. pup 148.
4. kiq 3.
5,10. gwb 136, 216.
6. hwd (Arabic), no. 59.
8. pt 138. (4:25)

End of Book