Sannyasa, the final stage of life, is total renunciation, in which even the discipline of continence becomes simply the person's settled nature
In the classical Hindu scheme of life stages, celibacy stops being a rule to follow and becomes, by the final stage, simply what a person has become.
The Manusmriti's sixth chapter describes sannyasa as the fourth and last of the traditional ashramas, following the celibate student stage, the married householder stage, and a period of gradual withdrawal in the forest. By this point, the text presents renunciation as total: the sannyasin has already released attachment to family, property, and social role, so continence is no longer experienced as a rule requiring active restraint but as the settled condition of a mind with nothing left to grasp toward. This distinguishes sannyasa from brahmacharya, the earlier celibate stage practiced by a young student still building toward a worldly life; here the same outward discipline exists for an entirely different, terminal reason. The Manusmriti frames this progression as the natural culmination of a well-lived life rather than an exceptional path reserved for the unusually devout.
Manusmriti