In this context, the Greek word translated “evident demonstration ” refers to“ convincing evidence ” of an invisible reality, such as the existence of Jehovah God, Jesus Christ, the angels, and the activities of the heavenly Kingdom.
(‏ عب ١١ :‏ ٣‏ )‏ وَنَحْنُ نُثْبِتُ بِأَقْوَالِنَا وَأَفْعَالِنَا أَنَّنَا نُؤْمِنُ فِعْلًا بِوُعُودِ ٱللهِ وَبِٱلْحَقَائِقِ ٱلَّتِي لَا تُرَى .‏