I don't need a reason to be happy with who I am.

描绘孤寂夜景，展现诗人独立苍茫的心境

For every expert there is an equal and opposite expert, but for every fact there is not necessarily an equal and opposite fact.

I'm a black American, I am proud of my race. I am proud of who I am. I have a lot of pride and dignity.

知识的每一次进步都会带来新的问题和新的困难。

解析：君子要求的是自己，小人要求的是别人。