That the Messenger of Allah ﷺ said: "If the people knew what I know about being alone, then a rider would not journey at night." - meaning alone.
أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ لَوْ أَنَّ النَّاسَ يَعْلَمُونَ مَا أَعْلَمُ مِنَ الْوَحْدَةِ مَا سَرَى رَاكِبٌ بِلَيْلٍ يَعْنِي وَحْدَهُ