Macbeth's letter.
ACT 1, SCENE 5: Lady Macbeth and the letter.
The extract is very important because it introduces Lady Macbeth for the first time in the play and gives the reader the main traits of the two characters' personalities, making also a comparison between them.
This scene is dominated by Lady Macbeth, who is probably the most memorable character in the play: her violent, soliloquies in the extract - from the tragedy "Macbeth" by William Shakespeare - testify to her strength of will, which completely eclipses the one of her husband who needs continuously someone who supports him.

In Inverness, Macbeth’s castle, Lady Macbeth reads to herself a letter she has received from Macbeth.
In the letter, Macbeth announces to his lady his promotion to the thaneship of Cawdor and details about his meeting with the three witches. But the reader already knows this facts so the really meaning of the letter is Lady Macbeth's behaviour. Writing immediately the letter to the lady, it seems that he confided in her, respected her and depended upon her advice and guidance. Behaving in this wave he is also complimenting her and affirming how she is one of the most important charachters of the tragedy. On the other hand, the behaviour of Lady Macbeth proves how her is the antithesis of the ideal wife: following the story, the reader will see how she spurs Macbeth to treason by disregarding his rational, moral arguments and challenging his manhood. Basically, she makes him to commit the murder, persuading him and Macbeth’s resistance, however, is not vigorous enough to stand up to his wife’s ability to manipulate him. This recalls the part of the Bible where Adam maked what the temptress Eve wanted him to do; at the end of her soliloque, in this scene, the reader can also imagine Lady Macbeth as the snake that lead Adam and Eve to the error.

The text may be divided into two parts: in the first one Lady Macbeth is reading the letter, the second one displays Lady Macbeth while is reflecting on her husband behaviour and describing it.
Through all the extract, the reader has to reflect on the several adjectives and drescriptions ("perfectest report"; "I burned in desire", "I stood rapt in the wonder of it") that show how much the 3 witches and their prophecy have amazed Macbeth and how the predictions have rendered him blind and ingenuous: all we know that during the Medioeval period women could be very dangerous, especially the women who were met in woods, but in this part of the tragedy Macbeth was so ambicious and totally exciting about his future as the king of Scotlandt hat he never called the three women "witches" but only as "they" or "weird sisters" like he was trying to convince himself that they were good entities, even if he was consciuous they were evil and most of all, they were witches ("they have more in them than mortal knowledge"; "they made themselves air".).
In the last part of the letter, Macbeth calls his wife "my dearest partner of greatness". This proves how important is Lady Macbeth for him and confirm his weakness: she is and will be the reason of all his power.
The second part of the extract shows a violent and cruel lady who is very strong-willed.
Lady Macbeth murmurs that she knows Macbeth is ambitious, but fears he "is too full o’ the milk of human kindness” to take the steps necessary to make himself king (line 15). She already knows she will have to manipulate her husband.
The last lines describe her as a perfid and ambicious person who will push someone else to do something terrible, but while she is describing the coming greatness she uses the words "fate" and "metaphysical": the two words belong to an area that is not under the control of human beings and this means how their future (Macbeth and Lady Macbeth's future) may be frail.