"Do not be bullied out of your common sense by the specialist; two to one, he is a pedant"

In this quote, Oliver Wendell Holmes is cautioning against blindly approving the opinions of experts and also specialists without applying one's very own good sense and judgment. He suggests that experts might become also concentrated on their area of expertise and also might lack a broader viewpoint. As a result, he recommends individuals to trust their own intuition and not be persuaded by the point of views of a narrow-minded expert.