The phrase "old mantra" refers to a traditional saying or belief that has been used for a long time. It can also imply repetition or a message that is often heard but may not be as effective or relevant anymore.
Sentences with «old mantra»
The simplest way for schools and parents to help avoid illnesses at school is that age - old mantra of effective hand washing. (qaeducation.co.uk)
But the same old mantra about the church as a whole, defective, substandard, and behaving badly gets old. (nakedpastor.com)
Speakers spout the same old mantra and you don't hear or learn anything new. (entrepreneur.com)