The advancement of mathematics is through the continuous questioning of established truths.
When we are no longer able to change a situation, we are challenged to change ourselves.
预测蓬勃发展的积极情绪与消极情绪的比例约为3比1。高于这个比例,人们往往会蓬勃发展;低于这个比例,人们往往会萎靡不振。