Further, no command can contradict another, so if you are faced with an apparent contradiction it is your own failure of discernment

That's false. I can easily refute you by saying you should defend your family (or country) with lethal force if necessary. In this case the command not to kill is contradicted by the command to love and serve your family. Choosing not to kill in this instance could actually be sinful.

You and I denounce Origen, and yet the introduction into Christianity of the thought that Christians have a "right of reserve" to not tell the whole truth is Origenism.

Not at all. You hold the Augustinian position which is the basis for the western Church. But the Eastern fathers agree concealment of truth and even deception is permissible in certain situations (pastoral flexibility) - precisely what Athanasius did in your anecdote.

Further, no command can contradict another, so if you are faced with an apparent contradiction it is your own failure of discernment

That's false. I can easily refute you by saying you should defend your family (or country) with lethal force if necessary. In this case the command not to kill is contradicted by the command to love and serve your family. Choosing not to kill in this instance could actually be sinful.

You and I denounce Origen, and yet the introduction into Christianity of the thought that Christians have a "right of reserve" to not tell the whole truth is Origenism.

Not at all. You hold the Augustinian position which is the basis for the western Church. But the Eastern fathers agree concealment of truth and even deception is permissible in certain situations (pastoral flexibility).