Say “i can” or say “i can’t,” and you’re right either way-what does this idiom mean?

he chooses to climb mount everest and decided not to any more due to the 1,000s of people making a line on the mountion

explanation:

1.the hosts on two opposing mountains stood,  

2.thick as the foliage of the waving wood;  

3.between them an extensive valley lay,  

4.o'er which the gleaming armour pour'd the day,  

5.when from the camp of the philistine foes,

6. dreadful to view, a mighty warrior rose; in the dire deeds of bleeding battle skill'd,