Djinn
and Tonic
The King of Red Lions says something similar when you gain the Master Sword.
A difference is made between the two sages and the other seven because the king already knows about the two, their temples, and their purpose. This is not to say that the king was unaware of the other seven. The mural in the basement of the castle that depicts them all shows that the Hylians would know all about the other seven sages and their purpose. After this you find Laruto and Fado who tell you that they offered prayers to empower the master sword.
The fact that the Master Sword lost the
power to repel evil suggests to me that
something has happened to the sages who
infused the blade with the gods' power.
The sages should be here in Hyrule...in the
Wind Temple to the north and the Earth
Temple to the south, praying to the gods.
You must head for these two temples to see
what has happened to the sages and
attempt to find a way to recover the
power to repel evil.
A difference is made between the two sages and the other seven because the king already knows about the two, their temples, and their purpose. This is not to say that the king was unaware of the other seven. The mural in the basement of the castle that depicts them all shows that the Hylians would know all about the other seven sages and their purpose. After this you find Laruto and Fado who tell you that they offered prayers to empower the master sword.