法華玄論 2.118

2.118

三明此華開合有時，開則為晝、合則為夜，以喻一乘隱顯有時，大緣未熟故隱、緣熟故顯。

Third, it clarifies that this flower opens and closes at specific times: opening during the day and closing at night, illustrating that the one vehicle is concealed or revealed at specific times—it remains concealed when the great conditions are not yet ripe, and is revealed when conditions are ripe.