Im pretty sure its verses are repeated but with slight variations
But, in an even bigger sense, we cannot dedicate this ground. The men we honor, living and dead, who have struggled, have consecrated it, far above low power to add or detract.
Integrity is your moral principles meaning doing the right thing. There are many definitions to integrity but the one that is most likely your answer is "the ability of being able to do the right thing." Integrity is YOUR moral principles or what you think is right or wrong. For example academic integrity is being able to always turn in your work on time, and trying your best o your work.
Hope this helps!