The past is a resource that can be used in the present.
You can't control commodity prices, but you can control how you respond to them.
你把桃子投于我,我把李子回赠与你。桃子和李子价值相当,表明我本人是知恩图报的,也有互相赠送,礼尚往来的意思。
在探索现实的基本性质的追求中,我们必须准备好质疑我们认为我们所知道的一切。