Quick Poll - Do you believe in God?

[Little Rik]

Ok, then.
I give you my explanation of the word sentient and then you will give me yours, Ok?
Sentient is what can help in your real progress whether is something material-physical or mental. 

Uh, no, that's not how it works.  You don't use a word and then apply whatever definition you please.  If you do that, the word is meaningless.  Sentient means "able to perceive or feel things" (Google), or "responsive to or conscious of sense impressions" (Merriam-Webster).  Which means that you don't even understand the explanation you quoted regarding how to develop and see auras, which is hilarious.  And since my own experience and diet (both fairly common) disprove your buddy's theory, you will need to get to work on an alternative one.  But please, before you quote another of your teachers, try to figure out just what it is he is saying, first.

For Christ sake Ton, don't be ridiculous.
What you find in the dictionary is not what come from personal experience and from PRACTICAL experience.
They are theories and theories are different from practical experiences.
By eating food you will know what make you sick and what make you feel better.
Physically speaking you know that by doing certain exercises you will feel better and by sitting on your arse for
long time you will get sick.
Mentally speaking you know that by mixing with bad people you also will become bad and mixing with good people
you will feel so much better.
Spiritually speaking is the same thing so from doing things you come to know what is good and what is bad that is why
a spiritual teacher can understand what is sentient (good) and what is tamasik (bad) or what is rajasick (in between good and bad).
Why should i learn things written by people that may have not practical experience?
You never thought about it Ton, did you?    

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[snip]
....We also need some veggies and in this case we cause some pain and suffering but we have to remember that
old saying.......NO BRAIN NO PAIN.
We can not live without causing some pain to plants but as far as we keep the pain to a minimum we do our very best.
I grow some veggies in my garden and when i need some i always cut the outer leaves so the plant keep alive and the suffering is kept at a minimum.
Animals on the other hand have a developed consciousness and when killed the pain is million times more that the pain that a plant would suffer so we really 
got to look at the damage in both quantity and as far consciousness is concern.   

A smaller step backwards is still a step backwards.  Why does our need justify the plant's pain?

You may do a step backwards if you are reckless in dealing with plants but you can also nullify the bad karma if you do things with the proper vision.
This is an important point in spirituality.
Life is such that we need to eat something alive.
We have no choice so if you understand this point you also understand that it is the creator way of so to speak running the creation in this way.
He (he-she) choose this way not us so it is his responsibility not ours.
There is a particular lesson in yoga that teach how to deal with this and to avoid to build up bad karma. 
As far as the plant is concern as i already said that by not having a nervous system or a developed consciousness she will feel a negligible amount of pain.