All things can be deadly to us, even the things made to serve us; as in nature walls can kill us, and stairs can kill us, if we do not walk circumspectly.
The least movement affects all nature; the entire sea changes because of a rock. Thus in grace, the least action affects everything by its consequences; therefore everything is important.
In each action we must look beyond the action at our past, present, and future state, and at others whom it affects, and see the relations of all those things. And then we shall be very cautious.
[Pascal Thoughts 505]