How would I translate the following into Spanish that seem the require an impersonal "se" and the reflexive pronoun "se"?

Question

1. One cannot see himself/herself in the dark.

When only the reflexive se is being used. the sentence.

no se puede ver en la oscuridad means he/she cannot see himself/herself in the dark

When only the impersonal se is being used, the sentence,

no se puede ver en la oscuridad means one cannot see in the dark.

However, I don't understand how to construct sentences when both the reflexive pronoun and the impersonal se is required.

likewise, I would translate sentences 2 and 3 in a similar manner which isn't the desired construction.

2. One should be happy with himself/herself.

3. One should judge himself/herself before judging others.

Answer 1

In such cases, the impersonal se is impossible, and uno is needed. The addition of a sí mismo (meaning oneself) is optional:

Uno no se puede ver [a sí mismo] en la oscuridad.

Uno debe quererse [a sí mismo].

Uno debe juzgarse [a sí mismo] antes de juzgar a otros.