"Reading is thinking with some one else's head instead of one's own. But to think for oneself is to endeavour to develop a coherent whole, a system, even if it is not a strictly complete one. Nothing is more harmful than, by dint of continual reading, to strengthen the current of other people's thoughts. These thoughts, springing from different minds, belonging to different systems, bearing different colours, never flow together of themselves into a unity of thought, knowledge, insight, or conviction, but rather cram the head with a Babylonian confusion of tongues; consequently the mind becomes overcharged with them and is deprived of all clear insight and disorganised. This condition of things may often be discerned in many men of learning, and it makes them inferior in sound understanding, correct judgment, and practical tact to many illiterate men, who, by the aid of experience, conversation, and a little reading, have acquired a little knowledge from without, and made it always subordinate to and incorporated it with their own thoughts."