Can you be in tune with the whole? Can you be so at one with the world that all your actions are in harmony with the world? Well, yes and no.
As long as there is a 'you' or a 'me' there is a sense of separation from the whole, a falling out of harmony with the whole. So 'you' can never be in complete harmony with the world or the whole. You will be more or less in disharmony with the whole. At best 'you' can be close to harmony. At worst, far from harmony. When close to harmony, the sense of 'me' is diminished to such a degree that 'your' actions are for others and for the whole, as best as 'you' can. When far from harmony 'your' actions would be disruptive and harmful to others and the world. The 'me' will be out of harmony to a greater or lesser degree. Or so it seems.
The good news is that there is a true Harmony. Harmony is the truth. Harmony is the truth within the appearance of disharmony. What appears to be you and what is believed to be you is not you. What appears has no limits. What appears is the Whole. There is nothing other than the Whole and it isn't really divided up into separate forms.
The human mind sees the world as separate and believes this, developing its sense of identity as separate from others or the rest of the world. This sense of separation is thought based and at the root of identity. This is the 'me' that can feel alone in the world, fearful of the world or angry against the world. The stronger the sense of separate identity, the more 'I' will feel distant, isolated, or at odds with the world. This is where the disharmony comes in.
The 'me' can't achieve harmony because it is by nature a sense of separation and disharmony. It's a separating out from the whole, like an imaginary cutting out a piece of the whole. But the whole is never truly separated. The Harmony is always here. The whole is always the whole. Nothing is gained or lost. It just is.
So what do we do to find this Wholeness? We let go of the sense of being separate. We allow the recognition of Oneness to permeate this sense of being separate, so that it gradually dissolves. Know that the sense of 'me' is witnessed, but you are not it. It appears and disappears within the whole. You are not this or that. You just are.