Identify the soliloquy of Macbeth in Act 4, scene 1, in Shakespeare's Macbeth, and analyze it.

I assume that you are referring to the speech Macbeth
makes at the end of Act Four, scene one, in Shakespeare's
play, Macbeth, when Macbeth decides how he will proceed with the
new information he has received, specifically from Lennox regarding
Macduff's flight to England.

By going to England, Macduff,
a good and decent man who loves his country, is branded a traitor—Macbeth knows that
Malcolm is in England enjoying the hospitality and protection of Edward the
Confessor.

Macbeth's speech is delivered as an "aside," so
that no one else on stage can hear him, but the audience knows what he is thinking.
Macbeth first comments (as he personifies time, as "anticipating") that "Time" knows
Macbeth's plans already. He admits that putting off one's actions never brings about the
results someone wants. He promises that from this time on, if he conceives a plan, he
will act on it—carry it out—instantly.

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[Aside.] Time, thou
anticipatest 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…  (IV.i.61-65)

Macbeth
intends to start joining his thought and actions right now. Macbeth
plans to surprise and seize Macduff's castle and its occupants, and then kill anyone in
there at that time: Macduff's wife, his children and his servants—anyone that can be
connected to Macduff in any way. We see in this that Macbeth has truly gone mad —killing
not Macduff, but his family—just to punish Macduff's rejection of Macbeth as
his King, as well as the true King of
Scotland.

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.
(168-170)

Macbeth promises
that he will not "boast" foolishly about what he intends to do, but
will carry out this deadly deed before he has a chance to think about it or before his
temper cools down. He wants no more visions, now; he just wants to strike
quickly.

No
boasting like a fool;

This deed I'll do before this purpose
cool.

But no more sights!–Where are these
gentlemen?

Come, bring me where they are.
(170-173)

The witches' second
set of predictions have given Macbeth a sense of invincibility—but it is a "false sense
of security," as Hecate had hoped. Macbeth is just as committed to his purpose as ever
before. He believes no one can touch him.