“Malignity, therefore, may dart its shafts, but no earthly power can deprive me of the consolation of knowing that I have not, in the whole course of my Administration (however numerous they may have been) committed an intentional error.”

1790s, Farewell Address (1796)

1800s, First Inaugural Address (1801)
Context: I shall often go wrong through defect of judgment. When right, I shall often be thought wrong by those whose positions will not command a view of the whole ground. I ask your indulgence for my own errors, which will never be intentional, and your support against the errors of others, who may condemn what they would not if seen in all its parts.

Preface.
The Vicar of Wakefield (1766)

Our Cry for Liberty, p. xv
Give Me Liberty! (1998)

This has sometimes been paraphrased: "My failures have been errors of judgment, not of intent".
1870s, Eighth State of the Union Address (1876)
Context: I leave comparisons to history, claiming only that I have acted in every instance from a conscientious desire to do what was right, constitutional, within the law, and for the very best interests of the whole people. Failures have been errors of judgment, not of intent.

Rex v. Lambert and Perry (1810), 2 Camp. 405.

The Economic Tendency of Freethought (1890)
Context: Note the difference between a right and a privilege. A right, in the abstract, is a fact; it is not a thing to be given, established, or conferred; it is. Of the exercise of a right power may deprive me; of the right itself, never. Privilege, in the abstract, does not exist; there is no such thing. Rights recognized, privilege is destroyed.
But, in the practical, the moment you admit a supreme authority, you have denied rights. Practically the supremacy has all the rights, and no matter what the human race possesses, it does so merely at the caprice of that authority.

Source: Ghost Story

Source: The House Of Commons At Work (1993), Chapter 9, The House of Commons Functions, p. 122