The story of Mind, From Yoga Vasishta:

There is a formidable and desolate forest in which there was a man. He was with a thousand hands and eyes. Apparently very confused, he would strike himself violently with iron bars and run about crying. Running about like that he fell in a dark well with a hidden way out.

It took him some time to find his way out and then he slowly got out of the well into a thorny forest. Then again, departing and beating himself often, running and laughing he managed to enter a cool forest of plantain trees. 

but he did not remain there for long. There also he started beating himself and running, he fell into the same well again ! He was as though drunk or semi conscious!!

Vasishta ji says: Having seen this for a long time , i held him by force ... and jolted him to consciousness. I then asked him " What is this ? Who are you? Why do you run in vain ?", thus asked, he said:
"I am no body, i do nothing. You are my enemy. Having seen by you, i am lost! Then , laughing, he gave up his limbs all around"
Thus in that forest, many men like him dwell, wandering about. That forest is there even today.

Sri Rama: Sage! What is that great forest ? What is it that they are intent on doing ?

Vasishta replies:

In this great forest of worldly existence, minds indeed wander about. They are lead by me , by discrimination, to supreme tranquility. Some, by disregarding me, fall down into hells. The forest of plantains is heaven. the affliction by sorrow is the thorn. "I am lost", when he said this, it was the cry of ego ... the feeling of me and mine ! The beatings are the blows of fancies or imaginations. They are indeed caused by oneself. The mind is reduced to a state of bondage only by its own imaginations and impressions. Like a silk worm in the cocoon one binds oneself by one's own imaginations and super-impositions.
This story of mind has been narrated to you. Contemplate on it with the mind , using this discrimination observe the mind and reject the fancies or imaginations of mind.

prahaaraaH kalpanaaghaataaH kriyante svayameva hi |
sa.NkalpavaasanaajaalaiH svairevaayaati bandhanam|
mano liilaamayaiH bandhaiH koshakaarakR^imiryathaa ||

प्रहाराः कल्पनाघाताः क्रियन्ते स्वयमेव हि।
सँकल्पवासनाजालैः स्वैरेवायाति बन्धनम्।
मनो लीलामयैः बन्धैः कोशकारकृमिर्यथा॥

The beatings are the blows of fancies (or imaginations). They are indeed caused by oneself. The mind is reduced to the state of bondage only by its own net of impressions of imaginations, just as the silk worm in the cocoon confines itself by bonds with ease.

THE STORY OF THE CHILD - YOGA VASISHTA

prapa~ncotpattireva.N hi baalakaakhyaayikaakramaat |
raajaputraaH trayaH santi shuuraa asati pattane ||

प्रपञ्चोत्पत्तिरेवँ हि बालकाख्यायिकाक्रमात्।
राजपुत्राः त्रयः सन्ति शूरा असति पत्तने॥

The origin of the world is indeed like this, in the manner of a tale narrated to a child (by the mother). There are three brave princes in a non-existent city).

Of these three, two were never born and the other one never indeed was stationed in a womb.

dadR^ishuH gagane vR^ixaan bhuktvaa svaadu ca tatphalam |
sarittritayamaaseduH pathi kallolamaalitam ||

ददृशुः गगने वृक्षान् भुक्त्वा स्वादु च तत्फलम्।
सरित्त्रितयमासेदुः पथि कल्लोलमालितम्॥

Once having gone out with the object of acquiring the best, they saw in the sky trees possessing fruits and having eaten those sweet fruits they reached three rivers crowned by large waves , on the way.
There [amongst those riverse], one was completely dry and there was not even a little water in the other two. Having bathed there and sported in the water, and having drunk the water... The three reached a city about to be (of the future), and the end of the day. There they saw three beautiful mansions. One was without walls and pillars, the other two houses were non-existent. There they obtained three pans (vessels) made of molten gold. In those pans they prepared food and served it to brahmanas who were without mouths ! Then they themselves ate the remnants and stayed there happily.

dhaatryaa hi kathitaametaa.N nirvicaaradhiyaa yathaa |
baalo nishcayamaayaati vicaarojGYitacetasaam |
iya.N sa.Nsaararacanaa.apyavasthitimupaagataa ||

धात्र्या हि कथितामेताँ निर्विचारधिया यथा।
बालो निश्चयमायाति विचारोज्ज्ञितचेतसाम्।
इयँ सँसाररचनाऽप्यवस्थितिमुपागता॥

Just as a child attains conviction in this tale narrated by the mother due to a thoughtless [unreflecting] mind, this creation of the worldly life too has assumed existence to those from whose minds reflection (or enquiry) has left (or dropped).