Interpretation:
What time guidance will appear is unknown. Throughout the Ofudesaki, God is telling the early followers about the guidance that will be given, to help us understand the heart. By understanding our own hearts, we can purify our own minds. The pure Original mind (shinjitsu) is the primary goal that is mentioned in the Ofudesaki. By attaining the Original mind, God will give us any blessings!
Heaven's Truths, in Healing the Body 