Renaissance humanism was the value of the individual.

Pico della Mirandola | Seminal Thesis (An Oration on the Dignity of Man) :
He argued that unlike all other forms of life, man had been created without a fixed place 'in order of things', but had the freedom to choose either to 'degenerate into the lower orders of life' or be born into the higher forms, which are divine' The great Craftsman , had created man to contemplate his work.'

Jacob Burckhardt | Publication (The Civilization of the Renaissance on Italy):
He stressed the importance of the cult of individuality that has been passed to us the idea of artistic 'genius' and an emphasis of human subjectivity 'man becomes a self-aware individual and recognizes himself as such'.

Architecture : 
The new sense of Objectivity was manifested in the emphasis on abstract FORM and PROPORTION, through which it was believed that various works of art can be made to conform to the principles underlying both man and the universe, while the feeling of subjectivity could be embodied using perspective. 

Read the 10 Books of Architecture by Vitruvius : 

http://academics.triton.edu/faculty/fheitzman/Vitruvius__the_Ten_Books_on_Architecture.pdf

Leonardo Da Vinci's Vitruvian man,
"Illustrating the ideal proportions of the "Ideal " man which he described in Book Three, De Architectura - proportions, which he argued, also was the base of the Classical Orders. "

A brief history of representing of the body in Western sculpture _ Khan Academy series :