Is it obligatory to recall the meaning of the Two Testimonies and ponder them when uttering them, or is it sufficient to utter them with heartfelt belief in their meaning?

Belief in the heart and certainty in the word of Tawhid (definition) are obligatory, based on the Almighty’s saying: "The believers are only those who have believed in Allah and His Messenger and then have not doubted but have striven with their properties and their lives in the cause of Allah. It is those who are the truthful," and the Hadith (definition) narrated by Muslim: "I bear witness that there is no god but Allah and that I am the Messenger of Allah. No servant meets Allah with these (words), not doubting them, but he will be shielded from the Hellfire." It is not obligatory to recall its meaning every time it is uttered, but it is preferable to recall it and ponder its meanings. Since the questioner has learned the meaning of the word and does not doubt it, she is a Muslim. It is advised to turn away from thinking about this matter, avoid isolation, mix with committed women, fill one's time with learning, worship, and social service, along with performing adhkar (remembrance of Allah), staying away from sins, making frequent supplications, and consulting psychological experts.