Must stop...

Expressions researched:
"must first stop" |"must stop" |"must therefore stop"

SB Canto 4

One may beget children up to the age of fifty, but after fifty, one must stop begetting children and should accept the vānaprastha order.

SB 4.27.7, Purport:

Even though we may produce many good children, our desire for sex that is beyond the prescribed method is to be considered sinful. Too much enjoyment of any of the senses (not only sex) results in sinful activities. Therefore one has to become a svāmī or gosvāmī at the end of his life. One may beget children up to the age of fifty, but after fifty, one must stop begetting children and should accept the vānaprastha order. In this way he must leave home and then become a sannyāsī. A sannyāsī's title is svāmī or gosvāmī, which means that he completely refrains from sense enjoyment. One should not accept the sannyāsa order whimsically; he must be fully confident that he can restrain his desires for sense gratification.