past tense or present>

[endeavor6636]

what we learn is solely from mistake.(i am not talking about what i learn, i
am citing a fact)

-what tense shall we use on this occasion.

[Mister Micawber]

.
If you are speaking of the past, use past tense. If you are speaking timelessly, use the present tense.
.

[RonBee]

Ditto what Mr. Micawber said.

[riverkid]

Originally Posted by endeavor6636

what we learn is solely from mistake.(i am not talking about what i learn, i
am citing a fact)
-what tense shall we use on this occasion.

Ditto for me, but the choice of tense is influenced by a number of factors.

What if we are speaking about a fact for an finished event that we see as important to now?

"What we have learned is solely from that mistake."

What if we are speaking about a fact for an future event?

"What we are going to learn will be solely from that mistake that I've just described. Roll the video."

What if we are giving our opinion speaking about a fact for an finished event that we see as important to now?

"What we should have learned is solely ... ."

The same for an event that will happen.

"What we should learn is solely ... ."

[endeavor6636]

wow, that's lots of choices

[riverkid]

Originally Posted by endeavor6636

wow, that's lots of choices

And I've hardly scratched the surface, Endeavor. OR

And I hardly scratched the surface, Endeavor.

[My choice, past simple or present perfect.]

The same simple verb phrase can be matched with any number of 'tenses' to express myriad ideas.