There are very clear scriptures and teachings that give us very clear guidance as to the qualities of a teacher that we should look out for when we check the teacher. We don’t simply get taken in by someone because they are charismatic or have a big following or are famous. It states clearly in the 50 Verses of Guru Devotion for example,
“In order for the words of honour of neither the Guru nor the disciple to degenerate, there must be a mutual examination beforehand (to determine if each can) brave a Guru-disciple relationship.
A disciple with sense should not accept as his Guru someone who lacks compassion or who is angersome, vicious or arrogant, possessive, undisciplined or boasts of his knowledge.
A Guru should be stable in his actions, cultivated in his speech, wise, patient and honest. He should neither conceal his shortcomings, nor pretend to possess qualities he lacks. He should be an expert in the meanings of tantra and in its ritual procedures of medicine and turning back obstacles. Also he should have loving compassion and a complete knowledge of the scriptures.
He should have full experience in both ten fields, skill in the drawing of mandalas, full knowledge of how to explain the tantras, supreme faith and his senses fully under control.”
There are many very clear teachings which give further commentaries on this such as Alexander Berzin’s book Relating to a Spiritual Teacher or Gurus for Hire, Enlightenment for Sale, by Tsem Tulku Rinpoche. They are very clear and logical points to consider – much like a process of checking out the qualifications of a doctor or a teacher.
And it is not just to check him as a person, but his teachings – where do they come from? His lineage? Where he received these teachings from? These are all factors to consider so we don’t end up in a relationship that could be harmful or which we lose faith in quickly.
Many people get themselves into trouble because they don’t check what they are getting themselves into. This is why the teachings so clearly state that the process of checking a teacher beforehand is of utmost importance. It is to protect ourselves if nothing else. Sometimes, it may not even be that the teacher is unqualified. It could just be the simple fact that you don’t “click” with this teacher or have that particular affinity. Still, you would need to check things out to see if you could really learn from this teacher or not – either way, the process of checking is very clear and important.