\ begin {quote}
\ textit{When...an infinitely small variation of the present state will alter only by an
infinitely small quantity the state at some future time, the condition of the system,
whether at rest or in motion, is said to be stable; but when an infinitely small variation
in the present may bring a finite difference in the state of the system in a finite time,
the condition of the system is said to be unstable.}"
\ end {quote}
\ begin {quote}
When.. .an infinitely small variation of the present state will alter only by an infinitely
small quantity the state at some future time, the condition of the system, whether at
rest or in motion, is said to be stable; but when an infinitely small variation in the
present may bring a finite difference in the state of the system in a finite time, the
condition of the system is said to be unstable.
\ end {quote}
\ begin {quotation}
\ textit{When.. .an infinitely small variation of the present state will alter only by an
infinitely small quantity the state at some future time, the condition of the system,
whether at rest or in motion, is said to be stable; but when an infinitely small variation
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