I feel the spirit of Extreme Practices is beautifully expressed in the following verse.

Of course we should, with apologies to the poet, reword the last three lines, before it can become an anthem for extreme practices.
---- 
"
Where the mind is without fear and the head is held high

Where knowledge is free

Where the world has not been broken up into fragments

By narrow domestic walls

Where words come out from the depth of truth

Where tireless striving stretches its arms towards perfection

Where the clear stream of reason has not lost its way

Into the dreary desert sand of dead habit

Where the mind is led forward by thee

Into ever-widening thought and action

Into that heaven of freedom, my father, let my country awake.

"

--Rabindranath Tagore (1861 - 1941)
Nobel Prize for Literature (1913)
----
The above verse is from Tagore's collection "Gitanjali" (1912), Translated from Bengali to English by W B Yeats.

National anthems of two countries (India and Bangladesh) are works of Tagore.