From Jagadguru Chandrasekhara Swami’s speeches:
The flower in a plant/tree is usually is bitter to taste.
When it becomes a budding fruit. It’s astringent in taste (tuvarpu, thurat).
A raw unripe fruit is sour.
It then ripens into a sweet colorful fruit.
It is this ripe fruit that falls to the ground free from its bondage to the tree. Not until then.
When a raw fruit is plucked, ‘tears’ (sap) of ‘sadness’ or ‘reluctance’ ooze out at the (point of) separation of the fruit from the tree.
No such ‘tears’ are shed when a mature fruit falls off the tree.
So with people. For a person, gaining tejas (lustre) and madhuram (sweetness/calmness in disposition) and his progressively breaking his ties with the world around (maya) are mutually reinforcing.
End
Vide Ramesh Babu to ஆன்மீக களஞ்சியம் and image from astroiyengar.com
Sanmargam 
Siddharth Gopal says: …Coming back to your blog, which is why the Sadhus and Siddhars thousands of years back ate the fruits, seeds and dead leaves(with medicinal properties) that had fallen off the trees. They never plucked or picked them.
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