There are greater forces and means for attacking than for defending the State. The reason is, that reckless and abandoned men need only a nod to set them moving, and their own natural disposition incites them against the State; while honest folk somehow or other show less activity, neglect the beginnings of movements, and are aroused to action at the last moment only by simple necessity; so that sometimes, owing to their hesitation and indolence, while they wish still to enjoy peace even with the loss of dignity, through their own fault they lose both.

[Maioribus praesidiis et copiis oppugnatur res publica quam defenditur, propterea quod audaces homines et perditi nutu impelluntur et ipsi etiam sponte sua contra rem publicam incitantur, boni nescio quo modo tardiores sunt et principiis rerum neglectis ad extremum ipsa denique necessitate excitantur, ita ut non numquam cunctatione ac tarditate, dum otium volunt etiam sine dignitate retinere, ipsi utrumque amittant.]

Marcus Tullius Cicero (106-43 BC) Roman orator, statesman, philosopher

Pro Sestio [For Publius Sestius], ch. 47 / sec. 100 (56-02 BC) [tr. Gardner (Loeb) (1958)]
    (Source)

(Source (Latin)). Other translations:

The constitution is attacked with greater forces and troops than wherewith it is defended; because audacious and reckless characters are set on by a nod, and are even of their own accord incited against the constitution; whilst the good are for some reason or other slacker, and from having neglected the beginnings of things, are at last aroused to action by mere necessity; so that sometimes, while they are willing to retain their tranquility even without freedom, through their own fault they lose both from their hesitation and tardiness.
[tr. Hickie (1888)]

The republic is attacked by greater forces and more numerous bodies than those by which it is defended; because audacious and abandoned men are impelled on by a nod, and are even of their own accord excited by nature to be enemies to the republic. And somehow or other good men are slower in action, and overlooking the first beginnings of things, are at last aroused by necessity itself; so that sometimes through their very delays and tardiness of movement, while they wish to retain their ease even without dignity, they, of their own accord, lose both.
[tr. Yonge (1891)]