It generally argues some degree of natural impotence of mind… a seat of authority.

Answer: The lines occur in Burke’s “Speech on Conciliation with America”, an unforgettable piece in the tradition of British parliamentary speeches. In the introductory part of his speech Burke tells about his position as a parliamentarian in coming up with the plan of conciliation with America.

Burke as a parliament member belonged to the opposition. He was advised by Mr. Rose Fuller, one of the influential members of his own party, that they should give up criticizing the government in moments of crisis and come forward with constructive plans for the restoration of peace and order in America. Burke, referring to Mr. Fuller’s advice, makes the quoted remark. Burke, being a pragmatic politician, knows that it is an act of a weak mind and feeble intellect to come up with plans without being in the authority. Because he belongs to the opposition, he hardly has any authority to do it. Naturally, his plans may not be sanctioned by the government and this may turn him into a laughable figure. He may even lose his reputation. Thus, Burke speaks of his position as a parliamentarian in presenting his scheme of conciliation to the House. Burke’s penetrating insight into worldly affairs is evident from the quoted lines.