He wanted a school and when the first was destroyed he managed to get another one. He argued and discussed until he accomplished.
There are two frames of thought about Blair. One that he picked battles with folks and therefore alienated people, and the other that he set out to provide school for the colonists and succeeded, wanting only the best.
He did tend to side with the laity (people of the church) rather than with the clergy. This caused enmity among the clerics. His strong opinions and unwillingness to back down was both a thorn in his flesh and a boon. It helped him to stick through battles so he could rebuild his school and face up against opposition, but at the same time, it caused hard feelings among his peers and made his job more difficult to do.
He did accomplish his task of reviving and reforming the church in colonial Virginia.