The evidence clearly suggests current-day pamphleteer Joe Spenner is the author of this quotation, not George Washington.
Author of the quotation
The author of the quote appears to be someone named Joe Spenner who authored a pamphlet in which there is an introduction by Spenner (note the absence of quote marks - he isn't quoting) containing the phrase in question, below this a horizontal dividing line, below the line are a series of quotations (in quote marks) attributed to George Washington. It seems clear that the quotation in question is part of Spenner's introductory remarks and Spenner is the original author.
A Facebook comment from an Eric Gustafson identified this source
Author of the image
The author of the image isn't sure if it's a Washington quote and doesn't care:
I added the rectangle to highlight the author's view of the reliability of the attribution. Other than my added rectangle, this is a straight clip from the facebook page from which the image in the question originated.
The phrase "evil plans" does not appear in George Washington's written works 1745-1799 as collected by John C Fitzpatrick
The preservation of his papers was a subject never far from the mind of George Washington. In fact, his deathbed instructions to his secretary Tobias Lear in December 1799, to "arrange and record all my late military letters and papers . . . and other letters," were only the continuation of a practice that Washington had begun as a young man when he began saving his incoming letters as well as copies of most of his outgoing correspondence. A half-century of farm management, land speculation, business enterprise, and public service eventually came to be represented in the mass of written material that comprise his public and private papers, some 135,000 surviving documents.
Comprised of more than 17,400 letters and documents in thirty-seven volumes (plus a two-volume index), Fitzpatrick's Writings was a monumental achievement by any standard. His experience in the Library of Congress, which owns the single largest collection of Washington manuscripts (more than 60,000 documents) ...
So if he did say it (or write it), it wasn't in what were regarded as his most important writings.
Earliest occurrence of key words
Searching Google ngrams for "a government has evil plans" finds nothing between 1732 and 1799. (it can find other phrases in that period so it's not due to a complete lack of data in that period)
The first occurrence of "evil plans" in Google's collection of 40 million books is in 1810 - long after Washington was laid to rest.
The attribution to Washington is most likely an error.