Excerpted from the Gospel of Sri Ramakrishna p.179
The Master Said:
"By practice one acquires uncommon power of mind.
Then one doesn't find it difficult to subdue the sense-organs
and to bring anger, lust and the like under control.
Such a man behaves like a tortoise, which, once it has tucked
in its limbs, never puts them out.
You cannot make the tortoise put its limbs out again,
though you chop it to pieces with an axe."