What is the truth that Paul was confirming to the gentile Galatians and from where did he get it?

If Paul is so pro-Torah elsewhere in Scripture, why does he speak so disparagingly toward it here in Galatians?

When is the doctrine of salvation by grace through faith established?  It is long before the New Testament.

After Paul has said so much supporting a Torah Observant lifestyle, what could he mean by suggesting the Law can be a curse?

Is there a such thing as "before Torah"?  Did God had to come up with a standard of righteousness on the fly or has His relationship with the human race always been defined according a consistent standard?  Did the need for a Messiah begin after Sinai or was it from the very beginning?  Our understanding of these concept is essential for grasping the the relationship between Jew and gentile, Law and grace, that Paul is describing in Galatians.

What is the role of Mediator that Paul is describing to the Galatians?

Since we are no longer under the Schoolmaster, as Paul says in Galatians 3:25, many believe that Torah must have no value for us.  In this teaching it is made clear that interpretation completely misses the apostle's point.