Giving student a trustworthy vision will ensure something a student can look back on and allow the student to succeed in their academic career and in their future career. This vision should be able to be replayed in the student's mind and has a realization effect when they complete their studies. It all starts with tell them the truth so that they can build this vision from the very beginning.
Working in education or any industry really listening to what the student is saying can help build trust. When making life changing decisions students trust advisers and faculty when making choices towards their future.
You should always speak the truth. There is no alternative to truth. We dont speak truth to build trust only, truth should be one of our core values, and trust is just an outcome of being truthful.
I agree once the student has been mislead about any source of documents, it is very hard to retain the heart of the student again