first place,
all atoms must have been in motion from all eternity; secondly, they
must all have had an equal motion; thirdly, they must all have moved
in a direct line; fourthly, they must all have moved by an immutable
and essential law.

I am still willing to gratify our adversaries, so far as to suppose
that those atoms are of different figures, for I will allow them to
take for granted what they should be obliged to prove, and for which
they have not so much as the shadow of a proof. One can never grant
too much to men who never can draw any consequence from what is
granted them; for the more absurdities are allowed them, the sooner
they are caught by their own principles.

SECT. LXXXIV. Atoms cannot make any Compound by the Motion the
Epicureans assign them.

These atoms of so many odd figures--some round, some crooked, others
triangular, &c.--are by their essence obliged always to move in a
straight line, without ever deviating or bending to the right or to
the left; wherefore they never can hook one another, or make
together any compound. Put, if you please, the sharpest hooks near
other hooks of the like make; yet if every one of them never moves
otherwise than in a line perfectly straight, they will eternally
move one near another, in parallel lines, without being able to join
and hook one another. The two straight lines which are supposed to
be parallel, though immediate neighbours, will never cross one
another, though carried on ad infinitum; wherefore in all eternity,
no hooking, and consequently no compound, can result from that
motion of atoms in a direct line.

SECT. LXXXV. The Clinamen, Declination, or Sending of Atoms is a
Chimerical Notion that throws the Epicureans into a gross
Contradiction.

The Epicureans, not being able to shut their eyes against this
glaring difficulty, that strikes at the very foundation of their
whole system, have, for a last shift, invented what Lucretius calls
clinamen--by which is meant a motion somewhat declining or bending
from the straight line, and which gives atoms the occasion to meet
and encounter. Thus they turn and wind them at pleasure, according
as they fancy best for their purpose. But upon what authority do
they suppose this declination of atoms, which comes so pat to bear
up their system? If motion in a straight line be essential to
bodies, nothing can bend, nor consequently join them, in all
eternity; the clinamen destroys the very es