"It was said that the wise one thinks 10 steps forward ahead of his next move.  was one of them."
This is two sentences from a story I am unsuccessfully trying to write. I remember from what my teacher said about keeping the same tense.
My problem is that; do I write "It is said" or is it "It was said"?
I'm slightly confused, and it would be of great appreciation if my confusion were to go away.
However, this is one case in which you don't need to stick with the past.
It's a "universal truth" type of thing, and you don't have to put it in the past, just like you don't have to backshift in reported speech when it's a universal fact.
The teacher said, "The Earth is round."
The teacher said that the Earth is round.
It is said that... is on the same level.
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.