Crispin believes that Bear read the writing on his cross. State the evidence which supports Crispin's belief. Explain your evidence.

In Chapter 28, Bear demands that Crispin hand over his cross. When Crispin protests, Bear assures him that he will not do the cross any harm. 
With the cross in his hand, Bear holds it up to the fire. Crispin begins to understand that Bear is trying to read the inscription on the cross. Desperate to find out if Bear can read what the inscription says, Crispin questions Bear. For his part, Bear does not answer; he merely hands the cross back to Crispin. Then, he tells Crispin that he needs his sleep and that the light is too weak for him to decipher what the cross says.
Bear's uncharacteristic behavior fuels Crispin's suspicion that the older man knows exactly what is written on the cross; he is just not prepared to talk about it. The next morning, Bear appears to be in a subdued mood. He steals glances at Crispin, especially when he thinks that Crispin isn't looking. Although Crispin is tempted to ask Bear for an explanation of his strange behavior, he refrains from doing so. Crispin knows that Bear will only speak when he is ready to.
So, it is Bear's uncharacteristic behavior that leads Crispin to suspect that Bear knows what is written on his cross.