Certainty of evidence does not lead to certainty of belief.
There are certain things that we cannot make ourselves believe， no matter how hard we try.
A proof of a proposition is a process the nature of which is such as to produce in us a belief in that proposition.
Philosophy ought really to be written only as a form of poetry.
The existence of the natural world is the same kind of fact as the existence of any proposition.
A non-moral use of a term does not necessarily tell us what the term means.
We can distinguish the blurred shapes and colours we see at a distance only because of the capacities of our eyes.
A proposition is an assertion that something is or is not the case.
In the actual world， a very great deal of the evil that is done does not spring from evil motives.
It is absurd to say that we have a duty to be benefited.
It is a logically necessary truth that the future will resemble the past.
To know good and evil is not enough； one must also do them.
It is a first principle of human action that a man does what he believes will satisfy his desires.
A sense of duty is just love of one's duty.
The duty of man is the same in respect to his own nature as in respect to the nature of all other things.
Ethics is the general enquiry into what is good.
证据的确定性并不导致信仰的确定性。
有些事情，无论我们多么努力，都无法使自己相信。