Ishavasya Upanishad: Mantra 13

अन्यदेवाहुः सम्भवादन्यदाहुरसम्भवात् । इति शुश्रुम धीराणां ये नस्तद्विचचक्षिरे ॥ १३॥ anyad evāhua¸¥ sambhavād anyad āhur asambhavāt iti śuśruma dhÄ«rāa¹‡Äa¹ ye nas tad vicacaka¹£ire Translation: It is said that from the manifest a different result is obtained than the one which is obtained from the unmanifest. All this was heard by the sages, who have imparted it to us. Commentary: Here again, similar to what we have seen in mantra 10, we are faced with two different directions, each offering different results, and each with its own advantages and disadvantages. The result of the cultivation of the manifest is expressed as progress in all the different fields and concerns, from architecture to engineering, from medicine to communication, from advanced nuclear weapons to interplanetary exploration, all the great discoveries and advancements of humanity have originated from a desire to conquer nature and control ones environment, which is evidently important to the human society. However, as long as this scientific and technological advancement and progress is not accompanied by a parallel development of maturity and growth on the level of consciousness, it can cause widespread harm, suffering and destruction. That is, evolution on the level of the manifest without spiritual evolution can bring about disasters and catastrophes. An electric saw can be an instrument of great value, but in the hands of an ape it can be extremely dangerous. It is possible to perceive the same result on the individual level, with those who develop their body and neglect their internal world, such as those who are capable of becoming athletes but at the same time suffer from terrible spiritual "rickets"; or those who enjoy wealth as measured in dollars and diamonds, but suffer from a poverty of the soul, and the spirit.

The entire contents of the Vedas are usually subdivided into three parts, known as tri-vidyā, or “three different classes of knowledge”: maybe tri-fold knowledge will sound better?

Enlightenment is to awaken to our completeness, as is affirmed in the invocation of the Iśāvāsyopaniṣad:

And without being aware of it, we are living in our nostalgias and reminiscences, memories, and reacting from that past, with expectations and hopes for the future. All of this is an idea, all of this is something that occurs only and solely in our mind. None of this is related to reality. none of this. Your expectations have no relation to the real existential dimension of facts which happens or unfolds solely in the present, now.