Human life is (1) _______ a unique blessing, which in turn depends on the (2) _______ of the Self. He who is not aware of the Self can neither have peace nor can he foster peaceful co-existence. We have to link our soul with God and body with the physical world for substance. (3) _______ the formless God is invisible to the naked eye, our mind often wanders wherever it goes. (4) _______ , we are unable to develop any love for the Divine. And religion like the white light of heavens (5) _______ multi-coloured fragmentations by the prisms of men and loses its gravity. Instead of uniting, it becomes a major dividing force. French philosopher Tailhard de Chardin, thinking deeply on meaning of our existence and relationship with the Divine, expounds, “we are not human beings having a spiritual experience, we are spiritual beings having a human experience”.

Select the most appropriate option to fill in blank no. 3.

The correct option is Since.

Step-by-step Explanation:
1. Analyze the context around blank (3): The sentence reads: "(3) _______ the formless God is invisible to the naked eye, our mind often wanders wherever it goes."
2. Determine the logical relationship: The clause "the formless God is invisible to the naked eye" describes the cause or reason behind the effect described in the second clause: "our mind often wanders wherever it goes." Therefore, the blank requires a conjunction that introduces a cause or reason (similar in meaning to "because").
3. Evaluate the given options:
- Since: This functions as a subordinating conjunction used to introduce a reason. It perfectly connects the cause to the effect, making the sentence grammatically correct and logically sound.
- From: This is a preposition indicating origin, starting point, or source (e.g., "from the beginning"). It cannot link these two clauses.
- As per: This phrase means "according to" or "in accordance with." It does not convey causality.
- For: While "for" can sometimes mean "because," it is a coordinating conjunction that cannot introduce a subordinate clause at the beginning of a sentence. It would only work if positioned between the clauses (e.g., "Our mind wanders, for the formless God is invisible").
4. Conclusion: Therefore, Since is the only grammatically and contextually correct choice.