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. 1.

To determine the most appropriate word to fill in blank (1), let us analyze the grammatical structure of the sentence:
"Human life is (1) _______ a unique blessing, which in turn depends on the..."

Here, the subject is "Human life", followed by the auxiliary verb "is". The sentence is expressing a general belief or opinion held by people about human life, which requires a passive voice construction.
The passive voice structure is formed using the auxiliary verb "be" (in this case, "is") followed by the past participle of the main verb.

Let's evaluate the given options:
1. considering: This is the present participle form (active voice), which does not fit grammatically after "is" in this context.
2. to consider: This is an infinitive form, which is grammatically incorrect here.
3. considered: This is the past participle form of the verb "consider". When combined with "is" ("is considered"), it correctly forms the passive voice, meaning "people believe human life to be a unique blessing".
4. consider: This is the base form of the verb, which cannot follow the auxiliary verb "is" directly.

Therefore, the grammatically correct and contextually appropriate word is "considered".

The correct answer is considered.