KiNGDOM and SPiRiT

If the kingdom of God has come crashing into this present evil age in Jesus' life, death, and resurrection [Mt 4.17, Mk 1.15, Gal 1.4, etc], how do we live as citizens of that kingdom in the here and now?

St Paul's answer is that we live by the Spirit [Rom 8, Gal 5-6, 1 Cor 12-14, Eph 4-6, etc]. 

Paul even says that the Spirit is the "down-payment" and/or "guarantee" of the life with God that is to come [Eph 1.14]. This Greek word for "guarantee" is only used several times in the NT. In his excellent book SIMPLY CHRISTIAN, Tom Wright says that this word "in modern Greek means an engagement ring, a sign in the present of what is to come in the future" [pg 125].