Truth
The truth has to be discovered.
The truth has not to be assumed and asserted.
Books
The young girl buys a number of books on obstetrics; she has read a few, but a few are still on the shelf.
In the meantime, she has a baby - she knows now.
Hindrance
The world is not a hindrance.
Work is not a hindrance either.
But attachment is a definite hindrance on our path to perfection.
The meditation-current
We should withdraw the mind into a shell whenever the mind is not actually occupied in essential activity, so that the mind is never idle, and is therefore not vulnerable.
Atman
Atman is that which is left after all the personal limiting adjuncts have been negated, by the process of: 'I' is not this body, 'I' is not this vital sheath, 'I' is not this mind, 'I' is not this intellect and 'I' is not this causal ignorance.