Saying of Abu Ayyoob Al-Ansaari.
إِذَا قُمْتَ فِي صَلاتِكَ فَصَلِّ صَلاةَ مُوَدِّعٍ “When you stand to perform your prayer, do so like a person bidding farewell.” وَلا تَكَلَّمْ بِكَلامٍ تَعْتَذِرُ مِنْهُ “And do not make remarks for which you will have to apologize.” واجْمَعْ الإياسَ مِمَّا فِي أَيْدِي النَّاسِ “And do not aspire to attain what the people possess.” From the hadeeth of Abu Ayyoob al-Ansaari [see Saheeh al-Jaami' #742]