This question requires us to choose the most suitable word to complete the sentence in the provided passage. The passage discusses human life, spirituality, and the challenges of maintaining focus, particularly concerning the mind's wandering. We need to find the word that best connects the idea of God's invisibility with the mind's tendency to wander.

The sentence in question is: "(3) ______ the formless God is invisible to the naked eye, our mind often wanders wherever it goes." We need to select the correct connector from the given options.

• The first part of the sentence states that "the formless God is invisible to the naked eye".
• The second part states that "our mind often wanders wherever it goes".
• The blank needs a word that logically links these two clauses. The invisibility of God is presented as a reason or condition that contributes to the mind wandering.

Let's examine each option:

• 1. Since: This conjunction is used to indicate a reason or cause. The sentence "Since the formless God is invisible to the naked eye, our mind often wanders..." makes logical sense. It implies that *because* God is invisible, the mind finds it difficult to focus and wanders.
• 2. From: This is a preposition, typically indicating origin or separation. It doesn't fit grammatically or logically as a connector for these two clauses. "From the formless God is invisible..." is incorrect.
• 3. As per: This phrase means 'according to'. It doesn't fit the context or grammar. "As per the formless God is invisible..." is nonsensical here.
• 4. For: While 'for' can sometimes act as a conjunction meaning 'because', it's less common in this specific structure than 'since'. Grammatically, 'since' provides a smoother and more direct causal link in this context.

The phrase "the formless God is invisible to the naked eye" serves as the reason why the mind might wander. The conjunction 'Since' effectively introduces this reason. Therefore, 'Since' is the most appropriate word to fill in the blank, establishing a clear cause-and-effect relationship.

The completed sentence reads: "Since the formless God is invisible to the naked eye, our mind often wanders wherever it goes." This conveys that the difficulty in perceiving the divine directly contributes to the mind's lack of focus.

Based on the grammatical structure and the logical connection required between the two clauses, 'Since' is the most suitable option.