The 7 is the number of spirituality, mysticism, wisdom and success.
God made the world in six days and rested on the seventh. The 7 turns its back on the upcoming numbers, does not start the fervent work of the 8. It looks back in retrospect on all the lessons it has learned in 1 through 6, or to reflect on work well done, just as God looked upon his creation and saw that it was very good.
The 7 is a number of faith. They seek spiritual wisdom unless they are negative. Then faith is replaced with fear and the strong, quiet person is, instead, an incessant talker.
The 7’s prefer quality to quantity. They want to share their life with someone they admire or they would rather be alone. They are very private people and can be hard to know. Only when they know and like you will they open up and be friendly. They may seen cold but they do like to do things for people.