فَإِذَا عَزَمۡتَ فَتَوَكَّلۡ عَلَى ٱللَّهِۚ إِنَّ ٱللَّهَ يُحِبُّ ٱلۡمُتَوَكِّلِينَ
Then when you have taken a decision, put your trust in Allah, certainly, Allah loves those who put their trust [in Him].
Surah aal-Imran (Ch3) Verse 159
The statement, ‘And once you have taken a decision, place your trust in Allah’ also clarifies that placing one’s trust in Allah does not mean that the efforts to provide means and make plans should be abandoned. The fact is that placing one’s trust in Allah while leaving off means near at hand is contrary to the blessed practice of prophets, and against the teachings of the Holy Qur’an.
However, if one sits idle dreaming about distant means and irrelevant concerns, or if one relies solely on means and plans as effective agents and ignores the Prime Causer of means and the Planner-par-Excellence of all affairs and plans, then this would certainly be against tawakkul, the placing of trust in Allah.
We get a really good sense of the meaning of que sera, sera from these lines of the song. The little girl wants to know what is going to happen to her in the future. She wonders if she will be rich and pretty. Then in the chorus, her mother tells her that whatever is going to happen is going to happen. If it’s meant to be, then it’s meant to be, and there’s nothing you can do about it.
The phrase is used today as a way of expressing acceptance in something that you can no longer control, as in, ‘I’ve done all that I can and I can’t go back and change anything now.’ Let’s say you were studying for a 1st class degree in Mathematics You ran do all the work, exercises, reading and you have already gone over all the material studied in the past 3 years, and now you’re left completing the exams. That would be a ‘que sera, sera‘ situation. There’s no longer a need to worry.