To the best of my knowledge, that wording is not contained in our Grand Lodge Law. However, you may find it in the first paragraph here:
http://grandlodgeoftexas.org/what-is-freemasonry/
The same sentiment, worded somewhat differently, is found in our Monitor, in the last sentence of the following excerpt from the charge given to each Candidate during his preparation:
"Freemasonry is, in one of its major aspects, a beautiful and profound system of morality, veiled in allegories and illustrated by symbols. Its grand purposes are, to diffuse light; to banish ignorance; to promote peace and happiness among mankind; to relieve distress; to protect the widows and orphans of our brethren; to inculcate a wider knowledge concerning the existence of the Grand Architect of the Universe, and of the arts and sciences connected with His Divine laws. In fine, the design is to make its members wiser, freer, better and consequently happier men."