“I have no spur to prick the sides of my intent but only vaulting ambition which o’erleaps itself and falls on th’ other”

o’erleaps = leap or jump over

th’ = the

spur = a device with a small spike or a spiked wheel that is worn on a rider’s heel and used for urging a horse forward

vaulting ambition = intense (a lot) desire of power

ambition = a strong desire to do or achieve something

intent = intention or purpose

“I have no spike to prick the sides of my intention but only a power desire which jumps over itself and fall on the other”