Experience makes us suddenly realize why we often fail to learn from experience. ——Bernard Shaw

Experience is a gem, it is a matter of course, because it is often obtained at a great price. ——Shakespeare

Doubt everything. ——German philosopher Karl Marx

To govern less is to govern well. ——Jack Welch, President of General Electric Company

The only limit to our understanding of tomorrow lies in our doubts today. ——(American politician) Roosevelt

Suspicions in the mind are like bats among birds, they always fly at dusk. ——(British philosopher) Bacon

Reading is to build one's own thoughts with the help of other people's thoughts. ——Lu Bajin

Please reflect carefully on everything left by pain! Once the suffering is over, it will become sweet. ——Goethe

Books are not only life, but also the source of cultural life in the present, past and future. ——Kufayev

Doubt is no fun, but certainty is even more absurd. ——(French Enlightenment thinker) Voltaire

The most valuable quality of a person is the ability to wisely realize what not to believe.

——(Ancient Greek playwright) Euripides