Romans 8:16-18 The Spirit itself bears witness with our spirit, that we are the children of God:

AKJV_Strongs⁽ⁱ⁾

16 G4151 The Spirit G846 itself G4828 bears G4828 witness G4151 with our spirit, G5043 that we are the children G2316 of God:

17 G1487 And if G5043 children, G2532 then G2818 heirs; G2818 heirs G2316 of God, G4789 and joint-heirs G5547 with Christ; G1512 if G4841 so be that we suffer G2532 with him, that we may be also G4888 glorified G4888 together.

18 G3049 For I reckon G3804 that the sufferings G3588 of this G3568 present G2540 time G514 are not worthy G1391 to be compared with the glory G601 which shall be revealed in us.