a fervent heart的用法和样例：
- Be like a kitten and cry to Him with a fervent heart.
- The teacher had a fervent heart all the time to the student, and his teaching methods were also unique.
- He's a fervent believer in free speech.
- She had a fervent farewell speech.
- She has a fervent desire to win.
- To make a fervent request or an entreaty.