We are discreet sheep; we wait to see how the drove is going, and then go with the drove. We have two opinions: one private, which we are afraid to express; and another one - the one we use - which we force ourselves to wear to please Mrs. Grundy, until habit makes us comfortable in it, and the custom of defending it presently makes us love it, adore it, and forget how pitifully we came by it. Look at it in politics.
Agassiz does recommend authors to eat fish, because the phosphorus in it makes brains. But I cannot help you to a decision about the amount you need to eat. Perhaps a couple of whales would be enough.
The common eye sees only the outside of things, and judges by that, but the seeing eye pierces through and reads the heart and the soul, finding there capacities which the outside didn't indicate or promise, and which the other kind of eye couldn't detect.