There must be some form of inner connection or resonance for any vibration to succeed in impacting an individual. On the more general basis, the physical body represents a connection to the material world, so that actions which impact the material world may obviously impact the physical body. Thus, all of humanity is subject to impacts by virtue of living in the world.
One of the reasons that Sri Aurobindo counsels opening of the heart center or else, focusing above the brain center, is that the development of these centers and their capacities can aid the seeker in controlling the uprush of the forces that normally find outlet through the lower chakras. It will be easier to gain control over the expression of those energies if the higher mental or psychic / spiritual action is strong.
In his book The Mother, Sri Aurobindo advises “To walk through life armoured against all fear, peril and disaster, only two things are needed, two that go always together — the
Grace of the Divine Mother and on your side an inner state made up of faith, sincerity and surrender.” He expands on the meaning and implementation of this in Chapter III of The Mother.
He has provided a method for both those who are more open at the developed mental level, as well as those who are receptive and open in the heart centre. The two actually are expressions of the inner receptivity of faith, sincerity and surrender, and the responding Grace of the Divine Force acting in the being.
Sri Aurobindo observes: “There are two things that make it impossible for them [the hostile forces] to succeed even temporarily in any attack on the mind or the vital — first, an entire love, devotion and confidence that nothing can shake, secondly, a calm and equality in the vital as well as in the mind which has become the fundamental character of the inner nature. Suggestions then may still come, things go wrong outside, but the being remains invulnerable. Either of these two things is sufficient in itself — and in proportion as they grow, even the existence of the hostile forces becomes less and less a phenomenon of the inner life — though they may still be there in the outer atmosphere.”
Sri Aurobindo, Integral Yoga: Sri Aurobindo’s Teaching and Method of Practice, Chapter 10, Difficulties in Transforming the Nature, Difficulties Due to the Hostile Forces, pp. 280-286