Rennie summoned patience.

Mr Weems shut his eyes and smiled; he did this when he was counting, which he did to summon patience.

Ziantha summoned patience.

She drank deep from her cup, and drew a long breath after, as if to summon patience.

She sighed and tried to summon patience without sounding patronizing, but she didn't quite make it.

Now, look, Edwina," he said, summoning patience, "I've things to do this holiday.