Cardinal virtues
Augustine of Hippo, discussing the morals of the church, described them:
The "cardinal" virtues are not the same as the three theological virtues: Faith, Hope and Charity (Love), named in 1 Corinthians 13. 
"And now these three remain: faith, hope and love. But the greatest of these is love."
Because of this reference, a group of seven attributes is sometimes listed by adding the four cardinal virtues (prudence, temperance, fortitude, justice) and three theological virtues (faith, hope, charity).
Together, they comprise what is known as the seven virtues. While the first four date back to Greek philosophers and were applicable to all people seeking to live moral lives, the "theological virtues" appear to be specific to Christians as written by Paul in The New Testament.
Seven generation sustainability
Instead, the only passage mentioning the number seven talks about qualities that Iroquois leaders should have, while the end of the passage advises them to consider the welfare of future generations."We now do crown you with the sacred emblem of the deer's antlers, the emblem of your Lordship. You shall now become a mentor of the people of the Five Nations. "The thickness of your skin shall be seven spans" -- which is to say that you shall be proof against anger, offensive actions and criticism. [...] "Look and listen for the welfare of the whole people and have always in view not only the present but also the coming generations", even those whose faces are yet beneath the surface of the ground -- the unborn of the future Nation."Oren Lyons, Chief of the Onondaga Nation, writes: "We are looking ahead, as is one of the first mandates given us as chiefs, to make sure and to make every decision that we make relate to the welfare and well-being of the seventh generation to come. ... What about the seventh generation? Where are you taking them? What will they have?"