‘For mine own good, All causes shall give way: I am in blood Stepp’d in so far that, should I wade no more, Returning were as tedious as go o’er…’
Had to look it up. Macbeth, Act III, Scene 4.
Meaning: (thank you, www!)
The quote "I am in blood / Stepped in so far that should I wade no more, / Returning were as tedious as go o'er" means that for Macbeth, it would be equally difficult to try to reform his ways as to continue in tyranny. He has reached a halfway point in all his slaughter and tyranny, so it will make little difference if he retreats from it or just keeps pushing through.
https://www.enotes.com/topics/macbeth/questions/what-does-i-am-in-blood-stepped-in-so-far-that-46387
