I saw there was no boundary lines between vegetable and animal life, and hence no beginning nor end to either... All physical phenomena, at their best, are dull and murky till they come up into spiritual life. As an illustration that every law has its universality take the familiar law or principle that action and reaction are equal. What is this but reaping the whirlwind after one has sown the wind, or how does natural law differ from this teaching: ‘Whatsoever a man soweth that shall he also reap?’ Are they aught but different strains in the great cosmic melody?
The first real mental illumination I remember to have experienced was when I saw that the universe exists in each of its individual atoms - that is, the universe is the result of a few simple processes infinitely repeated. When a drop of water has been mathematically measured, every principle will have been used which would be called form in the measurement of the heavens. All life on the globe is sustained by digestion and assimilation; when by voluntary and traumatic action these stop death follows. The history of an individual mind is the history of the race. Know one thing in its properties and relations and you will know all things.
Illusion and self-deception stand in the way of an honest, penetrating and fearless self-appraisal. Though it would appear that we have access to the innermost core of our individual being, and that there is nothing in the world with which we are on more intimate terms than our own self, the self remains an elusive object of knowledge and understanding.
Desire for knowledge is the path of honor: desire for wealth is the path of dishonor. Wealth is the chain that slaves wear; knowledge the kingly crown.
Through zeal knowledge is gotten, through lack of zeal knowledge is lost; let a man who knows this double path of gain and loss thus place himself that knowledge may grow.
Sentiment and principle are often mistaken for each other, though, in fact, they widely differ. Sentiment is the virtue of ideas; principle the virtue of action. Sentiment has its seat in the had; principle, in the heart. Sentiment suggest fine harangues and subtle distinctions; principle conceives just notions, and performs good actions in consequence of them. Sentiment refines away the simplicity of truth, and the plainness of piety; and "gives us virtue in words, and vice in deeds."
It is a fundamental principle that no person can entirely free himself from taking the people in his environment into consideration. When doing something in the presence of others, it is impossible not to think about how other people will view what you are doing... Any good act you do will be much purer if others are not aware of you.
There is no knowledge for which so great a price is paid as a knowledge of the world; and no one ever became an adept in it except at the expense of a hardened or a wounded heart.