We [may] answer the question: "Why is snow white?" by saying, "For the same reason that soap-suds or whipped eggs are white"-in other words, instead of giving the reason for a fact, we give another example of the same fact. This offering a similar instance, instead of a reason, has often been criticised as one of the forms of logical depravity in men. But manifestly it is not a perverse act of thought, but only an incomplete one. Furnishing parallel cases is the necessary first step towards abstracting the reason imbedded in them all.

Man lives in only one small room of the enormous house of his consciousness.

It is well for the world that in most of us, by the age of thirty, the character has set like plaster, and will never soften again.

It is astonishing how many mental operations we can explain when we have once grasped the principles of association

General scepticism is the live mental attitude of refusing to conclude. It is a permanent torpor of the will, renewing itself in detail towards each successive thesis that offers, and you can no more kill it off by logic than you can kill off obstinacy or practical joking.

[T]here is very little difference between one person and another, but what little difference ther eis, is very important.

In all primary school work the principle of multiple impressions is well recognized.