"I fear thou play'dst most foully for it" ↝ [a3s1]
Reflects B's growing suspicions of M
B didn't accuse M directly suggesting that he's also temped by the prophecy that his children will become kings - however, B's refusal to act on his own ambition makes him a stark contrast to M
'foully' - echoes 'fair is foul' however the absence of 'fair' suggests M's actions were completely corrupt and a result of his ambition
"Merciful power, restrain in me the cursed thoughts that nature gives way to in repose" ↝ [a2s1]
Contrasts LM, B calls out to divine powers to hep him resists the sinful thoughts that plague him
'restrain in me' - showcases B's fear of succumbing to the temptation. Highlights B's ambition & struggle with his moral commitment, setting him up as a foil to M, who allows his ambition to consume him
B understands the ludicrousness of plotting to kill the king based on unsubstantiated prophecies of supernatural beings
'cursed' - suggests B views such thoughts of ambition as negative & corrupt
"He hath wisdom that doth guide his valour to act in safety" ↝ [a3s1]
As envy is a cardinal sin, B is used by Shakespeare to explore the detrimental effects of envy & uncheckedambition - M's envy of B's abilities to restrain himself
M is envious of B's abilities to restrain his ambition & refrain from over-indulgence into "deep desires"
