The worst solitude is to be destitute of sincere friendship.
最大的孤独莫过于没有真诚的友谊。
Sometimes we pay the most for the things we get nothing, and that moment, may be the most frustrated.
And the worst solitude thing, may be destitute of the one who really know us.
The best preparation for tomorrow is doing your best today.
今天竭尽全力做到最好，就是为明天所做的最好准备。
Tomorrow may be uncertain to some extent.
Why it is uncertain?
Just because it is not based on a solid basement, that is to say, what we have done today.
So, doing our best today, here and now, is indeed the best preparation for tomorrow.