"Your invocation (duʿāʾ)" is your Īmān according to the statement of Allah ﷻ, "What would my Lord care for you if not for your supplication?" (Furqān 25:77). The meaning of duʿāʾ linguistically is Īmān.

{دُعَاؤُكُمْ} إِيمَانُكُمْ، لِقَوْلِهِ {قُلْ مَا يَعْبَأُ بِكُمْ رَبِّي لَوْلا دُعَاؤُكُمْ} -الفرقان ٧٧- ومعنى الدعاء في اللغة الإيمان۔