What are the ways to overcome laziness in performing prayer, given that the sister sometimes observes night vigil (qiyam al-layl) and recites the Qur'an, and how can the sister's husband be convinced to perform prayer when he believes that not harming others is sufficient, and he urges his wife to maintain her prayers on time?

Prayer is the pillar of the religion, and abandoning it severs the connection between the servant and his Lord, leading to manifest loss. Whoever is afflicted with abandoning it must repent sincerely, and remember that abandoning prayer is a cause for woe and torment in this world and the hereafter, and a reason for the dominance of Satan. Among the means that help in maintaining prayer are: accompanying the righteous, attending lessons of knowledge and listening to sermons, staying away from what distracts from it, praying sincerely, frequently engaging in remembrance of Allah, seeking forgiveness, reciting the Qur’an, sending blessings upon the Prophet, and remembering the punishment for abandoning prayer. Your sister's husband, who does not pray, is in great danger, and his saying "prayer is not everything" is a fallacy, for prayer is the pillar and foundation of the religion, and the religion is to be embraced in its entirety. "O you who have believed, enter into Islam completely," and he must be advised and reminded.