“I confess that there are several parts of this Constitution which I do not at present approve, but I am not sure I shall never approve them. For having lived long, I have experienced many instances of being obliged by better information, or fuller consideration, to change opinions even on important subjects, which I once thought right, but found to be otherwise.”
Speech in the Constitutional Convention, Philadelphia, Pennsylvania (September 17, 1787); reported in James Madison, Journal of the Federal Convention, ed. E. H. Scott (1893), p. 741.
Constitutional Convention of 1787
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Benjamin Franklin 183
American author, printer, political theorist, politician, p… 1706–1790Related quotes

“I know, but I do not approve. And I am not resigned.”

Variant: Surprizes are foolish things. The pleasure is not enhanced, and the inconvenience is often considerable.
Source: Emma (1815)

George Müller of Bristol: His Life of Prayer and Faith by A. T. Pierson. http://books.google.co.uk/books?id=novfn7wsmbAC&pg=PA367&lpg=PA367&dq=died+to+the+approval+or+blame+even+of+my+brethren+and+friends&source=web&ots=ZrwX2LG7QT&sig=LRgQD69A9HkqHIdOPhTQfmXKXDE&hl=en

Source: Love, Sexuality and Matriarchy: About Gender

Speech http://hansard.millbanksystems.com/commons/1845/apr/18/maynooth-college-adjourned-debate-sixth in the House of Commons (18 April 1845) in favour of the Maynooth College Act 1845.
1840s
B.C. Vickery (1970) Techniques of information retrieval, London: Butterworth. p. v; As cited in: Lyn Robinson and David Bawden (2011) " Brian Vickery and the foundations of information science http://www.iskouk.org/conf2011/papers/robinson.pdf".