The Shakespearean tragedy Macbeth is a play about the lengths one will go to satisfy his or her ambition and the consequences of one's desire (etext found here).
For brave Macbeth--well he deserves that name--
Disdaining fortune, with his brandish'd steel,
Which smoked with bloody execution,
Like valour's minion carved out his passage
Till he faced the slave.
Whether he was combined
With those of Norway, or did line the rebel
With hidden help and vantage, or that with both
He labour'd in his country's wreck, I know not
We will establish our estate upon
Our eldest, Malcolm, whom we name hereafter
The Prince of Cumberland; which honour must
Not unaccompanied invest him only,
But signs of nobleness, like stars, shall shine
On all deservers
suggesting the operation of supernatural influences
Whiles I stood rapt in
the wonder of it, came missivesfrom the king, who
all-hailed me 'Thane of Cawdor;' by which title,
before, these weird sisters saluted me, and referred
me to the coming on of time, with 'Hail, king that
shalt be!'
That's not to say the three witches aren't also strange, but that's not how 'weird' is being used here.
This have I thought good to deliver
thee, my dearest partner of greatness, that thou
mightst not lose the dues of rejoicing, by being
ignorant of what greatness is promised thee.
a verbal commitment agreeing to do something in the future
This have I thought good to deliver
thee, my dearest partner of greatness, that thou
mightst not lose the dues of rejoicing, by being
ignorant of what greatness is promised thee.