Nyanaponika Thera Quote

When once clear awareness and comprehension have been firmly established in a limited but vital sector of the mind's expanse, the light will gradually and naturally spread, and will reach even distant and obscure corners of the mind's realm which hitherto had been inaccessible. This will mainly be due to the fact that the instrument of that search for knowledge will have undergone a radical change: the searching mind itself will have gained in lucidity and penetrative strength.

p. 34 - The Heart of Buddhist Meditation (1965)