当新学期开始，以下是一些适合七年级学生的英文寄语：

1. "Embrace the challenges, for they are the stepping stones to success."（接受挑战，因为它们是通往成功的垫脚石。

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2. "Believe in yourself and all that you are. Know that there is something inside you that is greater than any obstacle."（相信自己和你所拥有的一切。知道你内心的力量比任何障碍都要强大。）

3. "Success is not final, failure is not fatal: It is the courage to continue that counts."（成功不是终点，失败不是致命的：重要的是勇于继续前进。）

4. "In the middle of difficulty lies opportunity."（在困难中蕴藏着机会。）