I was under the assumption that the word "platitude" implied that a statement was untrue, but according to the Cambridge online dictionary:
a remark or statement that may be true but is boring and has no meaning because it has been said so many times before
The statement "There are other fish in the sea", seems to fit this definition, but the following does not:
"We can do anything as long as we muster the resources and believe that we can achieve".
If I want to fly like a bird, and I muster all my resources and willpower, my feet will remain very firmly attached to the Earth.
Is there a word or phrase that means that an aphorism is devoid of any truth?