1.
There is no evidence that we can have any kind of knowledge outside of or prior to sensory knowledge.

2.
If only the mind (whatever the word means) is necessary then we should be able to have knowledge through it alone. That is, a person born with no other sense other than the mind (following Buddhism, I take the mind to be the sixth sense) then this person’s mind should be sufficient to allow him access to knowledge.

3.
There is also no evidence of a mind independent of the body, either before one is born or after one has died.