"He hath honored me of late, and I have bought Golden opinions from all sorts of people" (1.7.33-34).
"Wouldst thou have that Which thou esteem’st the ornament of life, And live a coward in thine own esteem" (1.7.42-44)
"True my lord" (3.1.120).
Macbeth's Shift
"Both of you Know Banquo was your enemy" (3.1.118-119).
"Thou losest labor. As easy mayst thou the intrenchant air With thy keen sword impress as make mebleed:Let fall thy blade on vulnerable crests; I bear a charmed life, which must not yield To one of woman born" (5.8.9-13)
Macbeth after Shift
"Despair thy charm, And let the angel whom thou still hast served Tell thee, Macduff was from his mother’s womb Untimely ripped" (5.8.13-16).
Macbeth talks to Lady Macbeth in Act 1, Scene 7 about the plan to kill Duncan. During this conversation, Macbeth reveals his doubts about the plan and his guilt. He explains how Duncan had honored him and it is wrong for him to murder him.
Macbeth goes through a shift in Act 3 Scene 1, where he is ordering two murderers to kill Banquo. Before the death of the king, Macbeth would never plan or think about killing anyone, but after taking the throne Macbeth becomes more suspicious and paranoid about how he could lose the throne.
Now Macbeth has completely shifted from the man who couldn't stand killing Duncan or anyone for power to someone who is willing to do anything for his throne. He has become completely paranoid and suspicious of everyone and everything, scared he will lose the mantle of king.