使用了定语从句修饰主语，后半部分通过否定形式形成对比，突出了句子的哲理性和讽刺意味。
Every tomorrow is unknown; even when the waters run smooth, one must still probe the depth with a stone.
Sunshine bathes the earth indiscriminately, regardless of human good or evil. — Seneca
Only those who believe themselves happy can truly enjoy happiness.
One who seeks to be friends with everyone is no one's true friend.
Do not pause; keep chasing your dreams. Do not give up; only by enduring the night will the sunrise come. Remember, success is just one step away, and there is no path back.
To explore the meaning of life and appreciate the value of existence, one must confront the dichotomies of life and death, safety and danger, joy and sorrow. These are often the scales by which our values are tested.
Remember that in the present moment, humans need delicate emotions as much as they need air. The subtlety of thought and the richness of intellect are the sources of such emotions.
In a lifetime, there is only one time when you can truly make a difference: now.
If suffering is the source of joy, why mourn over suffering?
Habit is a tenacious and immense force that can dominate one's life.
每一个明天都是未知的，纵使顺水行舟，也还是要投石问路。
阳光普照大地，不分人间善恶。——塞内加
只有认为自己幸福的人才能享受到幸福。
想和所有人做朋友的人，不是任何人的朋友。
别驻足，梦想要不停追逐，别认输，熬过黑夜才有日出，要记住，成功就在下一步，没有退路。
要探索人生的意义，体会生命的价值，就必须去追生与死，安与危，乐与苦，常常是检验人生价值观的尺度。
要记住，现在对人来说，如同需要空气一样，需要细腻的感情，而思想的细腻，智力的丰富，是它的源泉。
你在一生中，可以有所作为的时候只有一次，那就是现在。
既然痛苦是快乐的源泉，那又何苦为痛苦而悲伤。
习惯是一种顽强而巨大的力量，它可以主宰人生。
"This does not mean hearts have changed or that you are no longer friends"
"A smile costs nothing yet brings warmth; kind words require little effort but can win lasting friendships."
"If you seek flawless friendship you may spend a lifetime searching without success"
"If you give five to others, you gain the friendship of five people."
"Life without friends is like a world without the sun."