The great ascetic Shaqīq Al-Balakhī – Allāh have mercy on him – was once asked, “What is the mark of [true] repentance?” He replied, “Continued crying over past sins, deep fear of falling into them again, staying away from bad company, and keeping the company of good people.”
Abū Bakr Al-Daynūrī, Al-Mujālasah wa Jawāhir Al-‘Ilm article 2645.