He was a patient person because he didn't plan to kill the old man in one night. He secretly came to check on the old man while he was sleeping every night. This can be seen from the way he described, "..."
He is a patient person because he does not intend to kill an old man overnight. He sneaks in every night and watches the old man sleep, as can be seen from the moment he describes'... '
He is a patient man, because he didn't intend to kill the old man overnight, so he sneaked in and watched the old man fall asleep. Every night, we can see from his narration that "...".