What important words of advice has True Son’s father sent him in The Light in the Forest?

True Son's adoptive father, the Native-American chief Cuyloga, encouraged him from an early age to exact terrible revenge on the white man for what he's done to their people. As we reach chapter 7 of the story we find that True Son, now staying with his white relatives, is ideally placed to do this.
At a family reception. True Son's Uncle Wilse baits the young man, spewing out all kinds of racist bile against the Indians and trying to justify the massacre of the Conestogo tribe, in which he played a part. True Son's undeniably angry at this hateful outburst and rightly so, but he's not going to rise to the bait—at least, not yet. For True Son remembers Cuyloga's advice to bide his time until the time is right for him to put his plan of revenge into action.