God's love bestowed upon us - what it means and its effect

Behold, what manner of love the Father hath bestowed upon us, that we should be called the sons of God: therefore the world knoweth us not, because it knew him not. Beloved, now are we the sons of God, and it doth not yet appear what we shall be: but we know that, when he shall appear, we shall be like him; for we shall see him as he is. And every man that hath this hope in him purifieth himself, even as he is pure. (1 John 3:1-3)

1/ Beholding the manner of love that hath been bestowed upon us .
2/ Realising what this means - now are we the sons of God .
3/ The effect this love and realisation must have upon us .