当我们以为自己很重要的时候，世界才刚刚开始原谅我们的幼稚 的英文翻译

The world considers to contain the babyhood just before that we think we are something.

这个句子本身就把世界拟人化了，用consider思考 符合语境
contian 含包容的意思
后半部分也可以使用take somebody seriously 或 think too much of somebody 表达

The world just begin to tolerate us when we think we're important.

When we think we're very important,the world just starts to forgive us for our infantility .