A Calendar of Wisdom by Tolstoy
The difference between real material poison and intellectual poison is that most material poison is disgusting to the taste, but intellectual poison, which takes the form of cheap newspapers or bad books, can unfortunately sometimes be attractive. (January 1)
A thought can advance your life in the right direction only when it answers questions which were asked by your soul. A thought which was first borrowed from someone else and then accepted by your mind and memory does not really much influence your life, and sometimes leads you in the wrong direction. Read less, study less, but think more.
Learn, both from your teachers and from the books which you read, only those things which you really need and which you really want to know. (January 9)
A scholar knows many books; a well-educated person has knowledge and skills; an enlightened person understands the meaning and purpose of his life.
There are a limitless number of different sciences, but without one basic science, that is, what is the meaning of life and what is good for the people, all other forms of knowledge and art become idle and harmful entertainment.
We live a senseless life, contrary to the understanding of life by the wisest people of all times. This happens because our young generations are educated in the wrong way—they are taught different sciences but they are not taught the meaning of life.
The only real science is the knowledge of how a person should live his life. And this knowledge is open to everyone. (January 18)
If all knowledge were good, then pursuit of every sort of knowledge would be useful. But many false meditations are disguised as good and useful knowledge; therefore, be strict in selecting the knowledge you want to acquire. (March 16)
If you see that some aspect of your society is bad, and you want to improve it, there is only one way to do so: you have to improve people. And in order to improve people, you begin with only one thing: you can become better yourself. (March 17)
Beware of false knowledge. All evil comes from it.
Knowledge is limitless. Therefore, there is a minuscule difference between those who know a lot and those who know very little. (April 1)
Ignorance in itself is neither shameful nor harmful. Nobody can know everything. But pretending that you know what you actually do not know is both shameful and harmful. (April 18)
Every person has only one purpose: to find perfection in goodness. Therefore, only that knowledge is necessary which leads us to this. (May 3)
There are two very clear indications of real science and real art: the first inner sign is that a scholar or an artist works not for profit, but for sacrifice, for his calling; the second, outer sign is that his works are understandable to all people. Real science studies and makes accessible that knowledge which people at that period of history think important, and real art transfers this truth from the domain of knowledge to the domain of feelings.
Creating art is not as elevated a thing as many people guess, but certainly it is a useful and kind thing to do, especially if it brings people together and arouses kind feelings in them. (July 2)
It is better to know less than necessary than to know more than necessary. Do not fear the lack of knowledge, but truly fear unnecessary knowledge which is acquired only to please vanity. (September 23)