Three du'as that are not rejected
ثَلَاثُ دَعَوَاتٍ مُسْتَجَابَاتٌ لَا شَكَّ فِيهِنَّ: دَعْوَةُ الْمَظْلُومِ، وَدَعْوَةُ الْمُسَافِرِ، وَدَعْوَةُ الْوَالِدِ عَلَى وَلَدِهِ
Thalathu da'awatin mustajabat la shakka fihinna: da'watu-l-madhlum, wa da'watu-l-musafir, wa da'watu-l-walidi 'ala waladih.
"Three supplications are answered without doubt: the du'a of the oppressed, the du'a of the traveler, and the du'a of the parent for or against their child."
Narrated by Abu Hurayrah. Jami' at-Tirmidhi 1905 (hasan)
A short reflection
Honour the oppressed, keep parents praying for you, and when you travel, ask for big things.