Why Ramana's 'we must do' and 'we cannot do' aren't a contradiction

It would be a mistake to presume that a method itself does Without needing that emptiness and that allowing of God's will To unfold in our hearts, leading to true insight and love And that is the only way we can understand the sages When the sages told us we must do the self-inquiry And they also said that we can't do anything it all has to happen by grace I understand that now It would that seem like a contradiction otherwise Because there is a we must do the self-inquiry And they also say at some other time, maybe immediately after saying that Everything has to be done by God's grace Is it? I used to get very frustrated reading talks with Ramana Is it because just few pages back he said we must do And he says we cannot do anything it has to be his grace Is it? So it's a little more subtle than that