YOU SAID:

I thought my heart had learned its lesson

INTO JAPANESE

私の心はその教訓を学んだと思った

BACK INTO ENGLISH

I thought my heart learned the lesson

INTO JAPANESE

私の心はレッスンを学んだと思いました

BACK INTO ENGLISH

I thought my heart learned lessons

INTO JAPANESE

私の心は教訓を学んだと思いました

BACK INTO ENGLISH

I thought my heart learned lessons