What are the controls for understanding the cosmic verses (ayat kawniyyah) that God sends to His servant, and how does a person distinguish a divine message from mere coincidence, in order to avoid falling into confusion and anxiety from interpreting every event as a message?

There is no legal basis for such a statement. Some scholars have incorporated it into the Prophet's (peace be upon him) saying: "Safeguard Allah, and He will safeguard you," suggesting that Allah safeguards His servant through various means, including these warnings. The door to reflection and taking heed is wide, and for the believer, there is a lesson and admonition in everything, as Allah Almighty says: "Indeed, in that are signs for those who discern."