A life lived in harmony 38 a life without conflict. It must be a life where conflict leads to growth. Harmony is not the absence of conflict. It is the state in which conflict leads to positive change. Harmony is dynamic, not static. Innovation and growth challenge the status quo, shaking the very foundations where most base their values. Change only comes when we are ready to embrace it; change needs 39 . It is much easier to plant our feet in the traditional, the convenient, in what does not force us to reexamine our views. No one likes to be wrong. This is why great innovation comes with 40 , often bloody. The blood that is spilled is not always the one coursing through our veins: it is the blood of conviction, of prejudices, of deep-seated ideas that are abandoned by the inexorable force of reason. In fact, in science crises are essential: without them there is no 37 .