How did Sai Baba prove he knew about Laxmichand's private thoughts concerning his cough?

Sai Baba demonstrated his all-knowing nature in the incident involving his cough. As narrated in Chapter 28, during a Chavadi procession, Baba developed a cough. Laxmichand, witnessing this, privately thought to himself that the cough might be the result of someone's evil eye affecting Baba. The very next morning, Baba, speaking to Madhavrao but loud enough for Laxmichand to hear, verbalized this exact thought. He said, "Yesterday I had much coughing; is this the effect of an evil eye?" This astonished Laxmichand, who wondered how Baba could know his innermost thoughts, leading him to conclude that Baba dwells in everyone's heart.