As a general rule never take your whole fee in advance, nor any more than a small retainer. When fully paid beforehand, you are more than a common mortal if you can feel the same interest in the case, as if something was still in prospect for you, as well as for your client.
The indestructible is one: it is each individual human being and, at the same time, it is common to all, hence the incomparably indivisible union that exists between human beings.