Ya Hayyu Ya Qayyum

Abu Hurairah reported that whenever the Prophet, peace be upon him, was faced with a serious difficulty, he would raise his head to the sky and supplicate, "Subhan-Allah al-'Azim (glory be to Allah, the Mighty)." And when he implored seriously and strongly, he would say "Ya Hayyu, Ya Qayyum (O Ever-Living One, O Self-Existing One upon Whom we all depend)." (hadith of Tirmidhi)