A society that is not willing to demand a life of somebody who has taken somebody else’s life is simply immoral.

Thrift is care and scruple in the spending of one's means. It is not a virtue and it requires neither skill nor talent.

After death the soul possesses self-consciousness, otherwise, it would be the subject of spiritual death, which has already been disproved. With this self-consciousness necessarily remains personality and the consciousness of personal identity.

Give me matter, and I will construct a world out of it!

There is a limit where the intellect fails and breaks down, and this limit is where the questions concerning God and freewill and immortality arise.

Beneficence is a duty.

This can never become popular, and, indeed, has no occasion to be so; for fine-spun arguments in favour of useful truths make just as little impression on the public mind as the equally subtle objections brought against these truths. On the other hand, since both inevitably force themselves on every man who rises to the height of speculation, it becomes the manifest duty of the schools to enter upon a thorough investigation of the rights of speculative reason, and thus to prevent the scandal which metaphysical controversies are sure, sooner or later, to cause even to the masses.