If you are seeking truth then do not blindly believe in any Guru. Think for yourself. No blind belief can save you, work out your own salvation.+

Gurudom belongs to religion and yoga, not spirituality. If you are seeking truth then you have to tread the path alone.

Yoga Vasistha says: ~ Self-knowledge or knowledge of truth is not had by resorting to a Guru (preceptor) nor by the study of scripture, nor by good works: it is attained only through inquiry inspired by the company of wise (Gnani). One’s inner light alone is the means, naught else. When this inner light is kept alive, it is not affected by the darkness of inertia. 

There is no need to condemn Gurus, but there is a need to highlight how they become an obstacle in realizing the ultimate truth or Brahman.

Yoga Vasistha:~ "Teachers, interpretations of sacred texts, the force of religious merit--none of these lead to the realization of that Ultimate Truth which is revealed in the clear reflection of the heart, engendered from contact with the good."

Upanishads:~ Fools dwelling in darkness, but thinking they wise and erudite, go round and round, by various tortuous paths, like the blind led by the blind. (Upanishads Nikilanada - Ch II-5 P-14)

The seeker has to overcome all the obstacles in pursuit of truth on his own.  There are so many scholars who mastered philosophy.  It is impossible to acquire Self-knowledge by studying Vedas and theoretical philosophy. Because their preaching is based on spirit and practices are based on ego or waking entity.

It is very difficult to talk to people about the ultimate truth or Brahman because everyone thinks he knows the ultimate truth or Brahman. This- I know business is dangerous.  And whatever his reached conclusion is second-hand stuff.  Therefore, accepting accumulated knowledge without verification will lead the seekers to hallucinated realization based on the ego.  

One may have some flashes of truth when someone tries to indicate it through fewer words. But it takes nearer to truth, not realization. 

If you are seeking truth then do not blindly believe in any Guru. Think for yourself. No blind belief can save you, work out your own salvation. Have only one idea of the ‘Self’ that is an eternal help.   Advaitic Gnana is given neither from outside nor from another person.

Remember:~

Swami Vivekananda said: - “You have to grow from the inside out. None can teach you, none can make you spiritual. There is no other teacher, but your own Soul.”

The Guru is useless so long as the ultimate truth is unknown, and the Guru is equally useless when the ultimate truth or Brahman has already been known.

Guru is needed in the religious and the yogic path.  There is no need for a Guru to acquire Self-knowledge.

How do you know the guru you follow has realized the truth?  How do you know the guru’s teaching is the ultimate truth?

Katha Upanishad: ~ This Atman cannot be attained by the study of the Vedas, or by intelligence, nor by much hearing of sacred books. It is attained by him alone whom It chooses. To such a one Atman reveals Its own form. (Ch-II -23-P-20)

Thus, those who have taken the path of wisdom are chosen ones.  The chosen one will get the grace of the Soul, the inner Guru. The path of wisdom is the Soulcentric path, whereas all other paths are egocentric.  All egocentric paths lead to hallucination.

The  Soul, the inner 'Self 'reveals‘ what is real’ and ‘what is unreal” when the seeker is receptive and ready.

Sages of truth restrained themselves from the Self-knowledge, Brahma Gnana, or Atma Gnana to the masses and only a selected few. It was hidden from the ignorant populace which was not qualified and receptive to it. 

Self-knowledge or Brahma Gnana or Atma Gnana was not written down but was imparted orally to the chosen few. Thus, religion was given to the ignorant populace, and knowledge of the Spirit was given to only a selected few. Thus we find traces of the knowledge of the spirit in the religious books in the form of parables.

People believe that a Guru or mystic or priest has so many followers and therefore there must be some truth in their teaching, which is a common fallacy accepted by the masses due to their inherited conditioning. It proves only an ignorant can find a number of greater ignorant to follow him. 

Guru, Swami, Yogi, Sadhu, and Avatars belong to religious paths. Guru, Swami, Yogi, Sadhu, and Avatars have nothing to do with the ultimate truth or Brahman. Guru, Swami, Yogi, Sadhu, and Avatars are based on the false Self (ego), and false experience (waking).

To acquire Self-knowledge or Brahma Gnana or Atma Gnana there is no Guru required. The seeker has to grow from the inside out. None can teach him none can make him spiritual. There is no other teacher but his own Soul.

 In the path of truth, there is no need to follow anyone. The one who calls himself a Guru and the one who calls himself some Guru’s disciple will never be able to cross the threshold of duality.

All these experiences as a father, son, Guru, and pupil along with the world in which they all exist were one and the same consciousness appearing differently. All these distinctions disappear when one realizes the ultimate truth. : ~ Santthosh Kumaar