Can’t explain it better than my favorite Guru bhajan, which happens to be in simple Hindi.
Guru brahma roop jaano, shiv ka swaroop maano
Meaning: The Guru is no different from Lord Shiva Himself
Paapse bachaave Guru, Gnaanko sikhaave Guru
Meaning: The Guru is the one who saves us from sins, while also bestowing upon us the True Knowledge (of the Self)
Brahmase milave Guru, Turiya padh gyaan mein
Meaning: The Guru shows us Brahman through experience via the meditative Turiya state
The rest of this brilliant, enchanting yet simple bhajan will be continued tomorrow!