“There's a lot of things people think they can't do and then discover they can when they find themselves tight-wired.”

Source: Love Is a Mix Tape

Source: Looking for Alibrandi

Positive Thinking Every Day : An Inspiration for Each Day of the Year (1993), "April 13"
Earlier variant: People become really quite remarkable when they start thinking that they can do things. And those who have learned to have a realistic, nonegotistical belief in themselves, who possess a deep and sound self-confidence, are assets to mankind, too, for they transmit their dynamic quality to those lacking it.
‪You Can If You Think You Can‬ (1987), p. 84

1910s, Pygmalion (1912)

There is no evidence that Franklin ever actually said or wrote this, but it's remarkably similar a quote often attributed, without proper sourcing, to Alexis de Tocqueville and Alexander Fraser Tytler:
:A democracy cannot exist as a permanent form of government. It can only exist until the majority discovers it can vote itself largess out of the public treasury. After that, the majority always votes for the candidate promising the most benefits with the result the democracy collapses because of the loose fiscal policy ensuing, always to be followed by a dictatorship, then a monarchy.
Misattributed

Homebody (1998)

Referring to the reforms of the 1980s.
Source: New Zealand Wit & Wisdom (1998), p. 156.

as quoted by Gordon Shrum. In an article by Robert Craig Brown, The life of Sir John Cunningham McLennan http://www.physics.utoronto.ca/overview/history/mclennan, Physics in Canada, March / April 2000.