God wanted His altar to be built on unhewn stones, signifying that He didn't need any input of man on His work. This is analogous to His work of salvation through Jesus, we don't need to try to add or subtract from God's perfect gospel. Apply this to your personal life by not attempting to water down the truth of the gospel to please people; Jesus died for our sins to reconcile us to a perfect God that we couldn't reach on our own...POINT BLANK PERIOD