"Great thane of Glamis, great thane of Cawdor! Greater than both those titles for all the prophetic greetings for the future. Your letters have transported me beyond this unaware present, and now I feel already the future at this time."
Comment
In these lines, Lady Macbeth welcomes and greets her husband, who enters this scene for the first time. The Lady is very pleased with Macbeth's return and for his glorious future, which she knows from the letter that has described the meeting and the prophecy of the three witches. The style used by Shakespeare in these lines is very high: infact, Lady Macbeth starts her speech commending her husband's greatness. Furthermore, there is the use of repetition of the same sound at the beginning of the lines("Great",l.51, and "Greater",l.52; "Thy",l.53, and "This",l.54, and "The",l.55) and two run-on-lines("beyond - this ignorant present",l.53-54; "I feel now - the future",l.53-54).
in these statements, there is a reference to the Act I, scene III, lines 50, where the third witch says: "All hail, Macbeth, thou shalt be king hereafter", in lines 52(Scene V), because it seems that Lady Macbeth unconsciously echoes the words of the witch. In addiction, some scholars in the last part of this phrase have found, beyond a critique to the present situation, an irregularity in the metre of the line 54: "ignorant" must be pronunced like a word of two syllables and so there is a heavy stress on the words "feel" and "now", which necessitate a slight pause between them.
(Sottocornola)

 You, picking flowers and strawberries that grow 
 So near the ground, fly hence, boys, get you gone!
 There's a cold adder lurking in the grass. 

Others affirm that these lines are an allusion to arguably the most significant moment in Shakespeare's time, the discovery of the Gunpowder Plot. Shakespeare and his family had some deep connections to the conspirators. So he probably feared that he would be the next one taken to the Tower. The Bard used all his skills as a great playwright to set the record straight with his sovereign, James I, the son of Mary, Queen of Scots. While the conspirators were tried and executed for treason, Shakespeare would likely have been piecing together tales about different Scottish kings from old history books. His play, Macbeth, became a perfect propaganda machine that seemed to clear Shakespeare of any suspicion. To commemorate the discovery of the heinous scheme, King James had a medal created picturing a serpent hiding amongst flowers. Every person watching Shakespeare's drama in Jacobean England would have understood immediately the context and weight of such an allusion.

You shall put this night's great business into my dispatch
This line is further evidence to support the theory that Lady Macbeth intends to commit Duncan's murder herself. Modern readers might take the word dispatch to mean manage, in that Lady Macbeth is simply overseeing the murderous plan. However, in Elizabethan England, the word would have meant to kill with quick efficiency. Thus, Lady Macbeth prepares to slay Duncan while her husband plays the gentle host.
(Tosseghini)