اللَّهُمَّ أَرِنِي الْحَقَّ حَقًّا وَارْزُقْنِي اتِّبَاعَهُ وَأَرِنِي الْبَاطِلَ بَاطِلًا وَارْزُقْنِي اجْتِنَابَهُ
Allahumma arinal-haqqa haqqan warzuqnat-tiba'ah, wa arinal-batila batilan warzuqnaj-tinabah
O Allah, show me the truth as truth and grant me the ability to follow it, and show me falsehood as falsehood and grant me the ability to avoid it.
This du'a asks for two things: clarity of vision (to see truth and falsehood for what they are) and strength of will (to act accordingly). Many people can see the truth but lack the courage to follow it, or recognize evil but cannot resist it.
Related Du'as
رَبِّ اشْرَحْ لِي صَدْرِي وَيَسِّرْ لِي أَمْرِي وَاحْلُلْ عُقْدَةً مِّن لِّسَانِي يَفْقَهُوا قَوْلِي
My Lord, expand my chest, ease my task for me, and untie the knot from my tongue so that they may understand my speech.
Sahihاللَّهُمَّ انْفَعْنِي بِمَا عَلَّمْتَنِي وَعَلِّمْنِي مَا يَنْفَعُنِي وَزِدْنِي عِلْمًا
O Allah, benefit me from what You have taught me, teach me what will benefit me, and increase me in knowledge.
Hasanرَبِّ زِدْنِي عِلْمًا
My Lord, increase me in knowledge.
Sahihاللَّهُمَّ أَلْهِمْنِي رُشْدِي وَأَعِذْنِي مِنْ شَرِّ نَفْسِي
O Allah, inspire me with right guidance and protect me from the evil of myself.
Hasan