Hadhrat Mufti Mohammad Hasan (may Allah have mercy on him) said,

“There are two robbers on this path (of tasawwuf).

One of them is heedlessness:loosing focus (ghaflah), and the other is committing sin (ma’asiat).

As a safeguard from them one should sit in the company (suhba) of a pious person (Shaykh).”

Ahsan as-Sawanih, page 255