have need to
We men of study, whose heads are in our books, have need to be straitly looked after!
我们这些作学问的人，就知埋头书本，确实需要好好照看！
Most importantly you will seek friends that have much more in common with you, as normally the further you progress you have need to discuss your beliefs with those who are of a like mind.
最重要的是你将发现自己与朋友之间的关系更加和睦，通常的情况就是你进步的越多，你就有必要考虑与那些有相似心态的人讨论你的信念。
They should let their conduct show that they, too, have need to be guided and led by reason, and accommodate them-selves as far as possible to the feeling and the interests of the others.
他们应当让他们的行为来说明：理性上，他们也需要被指导和引导，并尽可能让自己适应其他人的感觉和兴趣。