未来不是现在提供的替代路径中选择的结果，而是一个被创造的地方——首先在思想和意志中创造，然后在活动中创造。
The future is not a result of choices among alternative paths offered by the present, but a place that is created—created first in the mind and will, created next in activity.
"The past is always present in the way we live now."
Mathematics is the poetry of logical ideas.
The only limit to our realization of tomorrow is our doubts of today.