Why couldn't Macbeth withstand his ambition to do wrong.

Macbeth could not withstand his ambition for doing wrong
because of his lack of brutality and his inert
humanity.

William Shakespeare's Macbeth depicts Macbeth as
a man who has a hidden ambition to be the king, but this is just like dream to him. He
never thinks to execute his plans until the "weird sisters" foretell him that he, once,
would be the king, and his wife poured oil into the fire of ambition. He seems to have
desire, but no wicked motive to achieve his goal. And, this is clearly expressed through
Lady Macbeth's speech: "yet do I fear thy nature, / It is too full o'th'
milk of kindness/ To catch the nearest way.../ What thou wouldst highly, /Thou wouldst
holily" (Act 1, Scene 5).

Later, once
prvoked and instigated, Macbeth is deeply drowned into the bloody sea of crime. He can
not be called a coward for not withstanding his ambition to do wrong, rather it is his
sense of morality which resists him from doing so. His ambition needed a spur, and after
getting it, he begins to lose that sense.