John Proctor can be said to possess integrity for a number of reasons.
First, we see that in act one, though he still has some feelings for Abigail—the young woman with whom he'd had an affair, despite the fact that he is married—he will no longer allow himself to indulge those feelings. He says that he "may have looked up" at her window and that he "may think of [her] softly from time to time," but he vows that he will "cut off [his] hand" before he ever reaches out to touch her in that way again. In other words, he knows what is right, and he is trying his best to do it, at whatever personal cost.
Second, in act two, we hear John say that he had "confessed" his affair to his wife, Elizabeth, when she first "told [him of her] suspicion" that he was cheating on her with Abigail. He could have denied it or he could have lied to her to cover it up, but he did not. Evidently, he confessed, "like a Christian," he says. This shows his integrity as well because he could have "roared [her]...
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