What enormous wisdom is needed to build up the simplest physical body of any living being; not to mention the most wonderful structure all living beings on earth; the human body!
Observe, for instance, man’s upper thigh bone; how wonderfully and in accordance with every rule of architecture the single little osseous joists and beams are put together! In its upper part, the upper thigh bone is far more complicated than it appears to us externally; for it is composed of a trestle of beams whose angles are arranged so skillfully that the weight of the whole body is borne by the least quantity of matter; truly a far greater work of art than the most complicated bridge construction; no engineering skill in the world could imitate it!
Or contemplate the structure of the heart: it is built so wisely that man with all his wisdom is but a child in comparison to that wisdom which reveals itself in the structure of the heart. How many things does the human heart withstand, though man’s foolish attempts to ruin it every day, for instance, through our so-called stimulants — coffee, alcohol, nicotine.
Source: Rudolf Steiner – GA 100 – Theosophy and Rosicrucianism: Lecture II: Introductory Explanations Concerning the Nature of Man – Kassel, 17th June 1907