The peace that Jesus gave his disciples calmed their hearts and minds and allayed their fears. Especially did they have peace when they received the promised holy spirit.
إِنَّ ٱلسَّلَامَ ٱلَّذِي أَعْطَاهُ يَسُوعُ لِتَلَامِيذِهِ هَدَّأَ قُلُوبَهُمْ وَعُقُولَهُمْ وَبَدَّدَ مَخَاوِفَهُمْ .‏