Holistic - relating to or concerned with wholes or with complete systems rather than with the analysis of, treatment of, or dissection into parts.[1]

Infosec - The protection of information systems against unauthorized access to or modification of information, whether in storage, processing or transit, and against the denial of service to authorized users or the provision of service to unauthorized users, including those measures necessary to detect, document, and counter such threats.[2]

Information security and assurance must be viewed holistically. No one service takes precedence or requires less scrutiny than any other. Servers, desktop PCs, network devices, web services, applications, code, policies and procedures...the list is endless. A lapse or weakness in any one can lead to a critical compromise of any other. From running a vulnerability scanner against servers to auditing your firewall ACLs to patching all systems regularly to assessing your web applications; they're all important and should all be viewed with heightened awareness.
Therefore, to define the philosophy of Holistic InfoSec.org would be to say this: A computing environment is the sum of many parts, a whole entity, and to secure it demands viewing it as a whole entity. A weakness in just one aspect of that environment has the propensity to compromise the environment as a whole. Assess it as a whole, analyze it as a whole, protect it as a whole.

We live in succession, in division, in parts, in particles. Meantime within man is the soul of the whole; the wise silence; the universal beauty, to which every part and particle is equally related, the eternal ONE. And this deep power in which we exist and whose beatitude is all accessible to us, is not only self-sufficing and perfect in every hour, but the act of seeing and the thing seen, the seer and the spectacle, the subject and the object, are one. We see the world piece by piece, as the sun, the moon, the animal, the tree; but the whole, of which these are shining parts, is the soul. -Ralph Waldo Emerson