even though we argue over the truth...

There is truth.

Our arguing over it doesn't negate it's ability to be known.

Our humanness means we will simply be incomplete in our knowledge of it.

The fast that God took the time to come near and teach us things...

His Incarnation and Revelation...

mean that we don't have to guess in the dark, but get grow in the Light.
"...you will know the truth, and the truth will set you free." (John 8:32)