Действительно, внешний вид человека часто отличается от его внутреннего мира, поэтому делать выводы о ком-либо, опираясь только на его наружность, неразумно.
Indeed, a person's appearance is often different from his inner world, so to draw conclusions about someone, relying solely on his appearance, it is unreasonable.
indeed, the appearance of rights often differs from his inner world, therefore, to draw conclusions about someone, just on the basis of the structure, unreasonable.