This Shielded Arjuna from Karna

Today, we will see why Karna did not use the lethal weapon Shakti against Arjuna and also the meaning of the 135th, 136th, and 137th divya namasas of Vishnu Sahasranama, Lokadhyaksha, and Suradhyaksha from -

लोकाध्यक्षः सुराध्यक्षो धर्माद्ध्यक्षः कृताकृतः

Karna had this deadly weapon called Shakti with him.
If he uses it on someone, anyone, even on a Deva or Asura, he will not survive.
Then why did he not use it against Arjuna?

Karna, as you know, was born with kavacha and kundalas on his body.
Nobody can defeat him as long as they are there on his body.
That's why Indra, Arjuna's father, came in disguise and took them away to ensure victory for his son.
Karna was famous for his charity.
If someone comes and asks for anything while he is praying, he will not refuse.
Indra took advantage of this, came, and asked for the kavacha and kundalas.
Karna readily gave them to Indra.
But interestingly, Indra asked him, 'Don't you realize who I am? Aren't you afraid that Arjuna would kill you without this kavacha?'
You know what reply Karna gave - 'Yes, I know who you are. I am not worried about my death. But his father having come in deceit to take away my protection, I consider Arjuna as a warrior who is already dead.
He doesn't have the guts to take me one-on-one.'

But then Indra himself felt bad about what he had done.
Indra gave Karna a weapon called Shakti and said - 'Whoever you use this upon will die.
But you can only use it once.'

From that time onwards, Duryodhana, Dusshasana, and Shakuni kept on advising Karna to save the Shakti to use against Arjuna.
Don't use it on anyone else.
Because if Arjuna is killed, then we have won the war.

On more than one occasion, Karna and Arjuna came face to face.
But still, Karna did not use the weapon against Arjuna.

Why?

Bhagavan himself gives the answer to this question.

अहमेव तु राधेयं मोहयामि युधां वर ।
ततो नावासृजच्छक्तिं पाण्डवे श्वेतवाहने ॥

Whenever they come face to face, I control Karna's mind. I manipulate Karna's mind in such a way that he wouldn't remember that he has the weapon with him with which he can kill Arjuna.

See what kind of protection Bhagavan's devotees get.
See to what level he goes.
This can happen with you also if you are a devotee of Bhagavan or maybe it is already happening and you are not noticing it.
Someone is approaching you with a bad intention, to attack and rob you, break into your house, and when he is just about to do that, he forgets. He forgets what he has come for, he gets distracted, he sees something, hears something, gets alerted, and runs away.
So many such incidents could have happened in your life; you really don't know.
That's how he is for his devotees, so caring, so protective throughout.

The names Lokadhyaksha, Suradhyaksha, and Dharmadhyaksha revolve around the same concept.
Loka means those who worship, Sura means those who are worshiped, and Dharma is the worship itself. Bhagavan presides over all these three. That's why he is addressed with these names.