小升初英语短文励志句子包括：

1. "Knowledge is a joy, and curiosity is the seed of knowledge."

2. "A person is not lovely for being beautiful but beautiful for being lovely."

3. "After a hurricane comes a rainbow."

4. "Our attitude defines life. Attitude determines the height of one's life."

5. "A bird may be known by its song."

6. "A bit in the morning is better than nothing all day."

7. "A blind man who leans against a wall imagines that it's the boundary of the world."

8. "Absence sharpens love, presence strengthens it."

这些句子可以作为小升初英语短文中的励志内容，帮助学生们表达自己的想法和感受，同时也能激发他们的积极性和乐观态度。