Abu Darda (radiallaahu `anhu) has said:
“A good companion is better than loneliness, and loneliness is better than a bad companion.The one who calls to goodness is better than the one who is silent, and the silent one is better than the one who calls to evil”.
[Al-‘Izlah wal-Infiraad, page 57 of Ibn Abi Dunya]
“Your souls are precious, and can only be equal to the price of Paradise. Therefore, sell them only at that price.”
-Ali ibn Abi Talib (R.A)