Instead of following my sincere desire to become a psychologist and philosopher, I studied engineering.

我并没有按照自己的真诚愿望成为一名心理学家和哲学家，而是学习了工程学。

And if he doesn't have a sincere desire to be a doctor, how can he have a sincere desire to do his homework?

如果他没有一颗当医生的心，又怎能有一颗做医学生作业的心呢？

He's never experienced or seen the life of a doctor, so he doesn't have a sincere desire to be one.

他从来没有体验过或看到过医生的生活，所以他并不是真心想成为一名医生。

And without a sincere desire to do his homework, he will procrastinate until the pain of not doing his homework reaches its limit.

而如果没有做作业的心，他就会拖延，直到不做作业的痛苦达到极限。

Express Sincerity and Expectation: No invitation letter is complete without the genuine expression of anticipation and sincere desire for the recipient's presence.

表达诚意和期望：如果没有真正表达对收件人出席的期待和真诚愿望，任何邀请函都是不完整的。

The mentee must trust that the mentor has knowledge or experience that is relevant to him or her, and the mentor must believe that the mentee has the sincere desire to listen and learn.

受训者必须相信导师拥有与他或她相关的知识或经验，并且导师必须相信受训者有真诚的倾听和学习的愿望。