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.
Vide Ramesh Babu to ஆன்மீக களஞ்சியம் and image from astroiyengar.com