Desistance from sin makes one entirely happy.
As quoted in Religion and culture of the Jains (1975) by Jyotipras?da Jaina, p. 187
All breathing, existing, living, sentient creatures should not be slain, nor treated with violence, nor abused, nor tormented, nor driven away.Mahavira
Non-violence and kindness to living beings is kindness to oneself. For thereby one's own self is saved from various kinds of sins and resultant sufferings and is able to secure his own welfare.Mahavira
Kill not, cause no pain. Nonviolence is the greatest religion.Mahavira
A living body is not merely an integration of limbs and flesh but it is the abode of the soul which potentially has perfect perception (Anant-darshana), perfect knowledge (Anant-jnana), perfect power (Anant-virya), and perfect bliss (Anant-sukha).Mahavira