Concentration (n.) of the real kind is not "practicing concentration" but being absorbed in whatever happens to be one's eternal now.
Concentration (n.) turned on one's own mind to find its root finds only one's own effort to concentrate.
Concentration (n.) on the mind until it is still is a disease, not dhyana.
Concentration (n.) cultivated is wrong-minded from the start: how could cultivating concentration ever obtain it?
Concentration (n.) on a hard book is not helped by thinking "I should concentrate," since then one thinks about concentration instead of the book.
Concentration (n.) is never perfect while one assumes a knower behind the knowing: one is always "in two minds."
Concentration (n.) is the mind's natural state: the thinker is always wholly absorbed in its thought, because there is nothing but the succession of thoughts.
Concentration (n.) is where the great Asian philosophies begin — a matter of attentive looking at what is there.
Concentration (n.) cannot be done while thinking about concentrating; the only way to concentrate is to concentrate.
Concentration (n.) for two seconds is all there is to concentration for two hours.
Concentration (n.) is at once the most consciousness and the least ego-feeling — which gives the lie to any psychology that equates consciousness with the ego.
Concentration (n.) is maximum mental efficiency with minimum purpose, since nobody can concentrate and expect a result from it at the same moment.
Concentration (n.) as most people do it — screwed-up face, knit brows — treats a mental problem like heaving bricks, though no one strains to digest.