"Paul means that believers know, from observation of God’s past dealings with those who love Him, that he has a mysterious way of working things out for the greatest good. By observing the stories of the saints of old—those called to accomplish His redemptive purposes—believers can rest in the knowledge of this truth. God can take whatever evil may come our way and redeem it for good. Believers can know this because God has been doing it for generations."
Leighton Flowers, https://soteriology101.com/2018/02/14/romans-828-30-foreknowledge-and-predestination/
"Calling" -kaleō
to identify by name or attribute, call, call by name,name
to request the presence of someone at a social gathering, invite
to use authority to have a person or group appear, summon
From the meanings ‘summon’ and ‘invite’ there develops the extended sense choose for receipt of a special benefit or experience, call