Using these lines from Act I and Act IV, explain how the Macbeth described in the beginning of the play is different from the Macbeth who is speaking these lines in ACT IV.
But all's too weak;
For brave Macbeth,—well he deserves that name,—
Disdaining fortune, with his brandish'd steel,
Which smok'd with bloody execution,
Like valor's minion,Carv'd out his passage
Till he fac'd the slave;
And ne'er shook hands, nor bade farewell to him,
Till he unseam'd him from the nave to the chaps,
And fix'd his head upon our battlements.
O valiant cousin! worthy gentleman!
Time, thou anticipat'st my dread exploits:
The flighty purpose never is o'ertook
Unless the deed go with it: from this moment
The very firstlings of my heart shall be
The firstlings of my hand. And even now,
To crown my thoughts with acts, be it thought and done:
The castle of Macduff I will surprise;
Seize upon Fife; give to the edge o' the sword
His wife, his babes, and all unfortunate souls
That trace him in his line. No boasting like a fool;
This deed I'll do before this purpose cool:
But no more sights!—
The MacBeth that is being described by the Soldier is a man who uses all his strength and power to fight for his King. He is loyal to King Duncan and puts his all into any battle. The fight that the Soldier is describing is the one between MacBeth and MacDonwald and at the end, MacBeth "fix'd his head upon [their] battlements" to show off his victory (Act I Scene II). Later on in Act IV, MacBeth has completely changed. MacBeth says that "the very firstlings of my heart shall be/ The firstlings of my hand", which means that whenever he thinks of doing something, he will commit it to it right away. The first action being the murder of MacDuff and "his wife, his babes, and all unfortunate souls" (Act IV Scene I). Instead of fighting in a war for his King, he is planning on murder with no hesitation.