I believe the following is correct.

Credo sequentum verum.

I can't figure it out, therefore it must be wrong.

Non possum comprehendere, ergo illum certe falsum esse.

I think, therefore I am.

Cogito, ergo sum.

I sense, therefore I must understand.

Sentio, ergo certe comprehendam.

(i probably need a lesson or two myself)