Have no fear of robbers or murderers. They are external dangers, petty dangers. We should fear ourselves. Prejudices are the real robbers; vices the real murderers. The great dangers are within us. Why worry about what threatens our heads or our purses? Let us think instead of what threatens our souls.

[Ne craignons jamais les voleurs ni les meurtriers. Ce sont là les dangers du dehors, les petits dangers. Craignons-nous nous-mêmes. Les préjugés, voilà les voleurs; les vices, voilà les meurtriers. Les grands dangers sont au dedans de nous. Qu’importe ce qui menace notre tête ou notre bourse! Ne songeons qu’à ce qui menace notre âme.]

Victor Hugo (1802-1885) French writer

Les Misérables, Part 1 “Fantine,” Book 1 “An Upright Man,” ch. 7 (1.1.7) [Bp. Myriel] (1862) [tr. Wilbour/Fahnestock/MacAfee (1987)]
    (Source)

(Source (French)). Alternate translations:

Have no fear of robbers or murderers. Such dangers are without, and are but petty. We should fear ourselves. Prejudices are teh real robbers; vices the real murderers. The great dangers are within us. What mater it what threatens our heads or our purses? Let us think only of what threatens our souls.
[tr. Wilbour (1862)]

Never let us fear robbers or murderers. These are external and small dangers; let us fear ourselves; prejudices are the real robbers, vices the true murderers. The great dangers are within ourselves. Let us not trouble about what threatens our head or purse, and only think of what threatens our soul.
[tr. Wraxall (1862)]

Let us never fear robbers nor murderers. Those are dangers from without, petty dangers. Let us fear ourselves. Prejudices are the real robbers; vices are the real murderers. The great dangers lie within ourselves. What matters it what threatens our head or our purse! Let us think only of that which threatens our soul.
[tr. Hapgood (1887)]

We must never fear robbers or murderers. They are dangers from outside, small dangers. It is ourselves we have to fear. Prejudice is the real robber, and vice the real murderer. Why should we be troubled by a threat to our person or our pocket? What we have to beware of is the threat to our souls.
[tr. Denny (1976)]

Never fear robbers or murderers. Thiose are dangers that come from without. Small dangers. Let us fear ourselves. Prejudices are the real robbers. Vices are the real murderers. The great dangers are within us. Never mind what endangers our life or our purse! Let's be mindful only of what endangers our soul.
[tr. Donougher (2013)]