It occurs by not engaging in ishāra (allusive indication) towards people before it comes from God. Allah outwardly expands this state for them when they are among people so that they may make dua (supplication) with them, but inwardly constricts it so that they do not say anything other than what God has commanded.
The form of tafrīd (isolation in God) at the bidaya (beginning) is that the servant purifies the ishāra (allusive indications) through worship of God. In the abwāb (spiritual gates), tafrīd is the purification of the ishāra through creed. In muʿāmalāt (spiritual transactions), the ishāra...