THREE: One of the greatest preventives of crimes is, not the cruelty of the punishments attached to them, but their infallibility, and consequently that watchfulness on the part of the magistrates and that inexorable severity on the part of the judge which, to be a useful virtue, must coincide with a mild system of laws. The certainty of a punishment, moderate though it be, will ever make a stronger impression than the fear of another, more terrible, perhaps, but associated with the hope of impunity; for even the least evils when certain always terrify mens minds, and hope, that gift of heaven, which often makes up to us for everything, always throws into the distance the idea of greater evils, especially when its force is increased by impunity, which avarice and weakness so often grant. There remain two questions for me to examine: the first, whether asylums of refuge are just, and whether international agreements of extradition are expedient or not. There should be no spot within the boundaries of any country independent of the laws. Every citizen should be followed by their power, as every substance is followed by its shadow. There is only a difference of degree between impunity and the right of asylum; and as the effective influence of punishment consists more in its inevitability than in its violence, asylums do more to invite to crimes than punishments do to deter from them. The multiplication of asylums is the formation of so many petty sovereignties; for where there are no laws to command, there it is easy for new laws, opposed to the general laws of a country, to be formed, and consequently for a spirit opposed to that of the whole collective social body to arise. All history shows that from asylums have issued great revolutions in States and in the opinions of mankind.