The other verbs and verb-appearing words in the sentence are ancillary. "Living" in the first clause is an adjective modifying forest, "it was going to be" is a verb clause in the simple past ("it was..."), and "guided" is also in the simple past.
The present form of this is: ...I know that it is going to be the moon that will guide [us]...
Its alternate, using present "guides" for future "will guide", but with the same meaning: ...I know that it is going to be the moon that guides [us]...
The past forms of the same sentences are:
...I knew that it was going to be the moon that would gu