حقیقت از اشتباهات کسی که با تحقیق و مطالعه به استقلال و برای خود فکر می کند، بهره بیشتری می برد، تا از عقاید درست عده دیگر که اعتقادشان به عقیده ای، … - John Stuart Mill

It's hardly possible to overstate the value, in the present state of human improvement, of placing human beings in contact with other persons dissimilar to themselves, and with modes of thought and action unlike those with which they are familiar. Such communication has always been... one of the primary sources of progress.

All honor to those who can abnegate for themselves the personal enjoyment of life, when by such renunciation they contribute worthily to increase the amount of happiness in the world; but he who does it, or professes to do it, for any other purpose, is no more deserving of admiration than the ascetic mounted on his pillar.

But I now thought that this end [one's happiness] was only to be attained by not making it the direct end. Those only are happy (I thought) who have their minds fixed on some object other than their own happiness[....] Aiming thus at something else, they find happiness along the way[....] Ask yourself whether you are happy, and you cease to be so.