Romans 4:21

and enjoyed the fullest assurance, that what he had promised, he was able also to perform.

Hebrews 11:19

reasoning that God was able to raise him up again, even from the dead; from whence also figuratively he had received him.

2 Timothy 1:12

For which cause also I suffer these things; but I am not ashamed: for I know on whom I have placed my confidence, and am persuaded that he is mighty to guard my deposit unto the great day.

Matthew 19:26

And Jesus looking upon them, said unto them, With men this is impossible; but with God all things are possible.

Luke 1:37

For there is nothing impossible with God.

Luke 1:45

And blessed is she that hath believed; for there shall be a fulfilment of the things told her from the Lord.

Romans 8:38

For I am assured that neither death, nor life, nor angels, nor principalities, nor powers, nor things present, nor those to come,

Romans 14:4

Who art thou that judgest another man's servant? To his own master he standeth or falleth; but he shall be established: for God is able to establish him.

2 Corinthians 9:8

And God is able to make all grace abound towards you; that in every case having always all sufficiency, ye may abound unto every good work:

Hebrews 11:13

All these died in faith, not having received the promises, but beholding them at a great distance, though believing and embracing them, and confessing that they were strangers and sojourners in the land.

Treasury of Scripture Knowledge

Summary

And being fully persuaded that, what he had promised, he was able also to perform.

Bible References

Fully

Romans 8:38
For I am assured that neither death, nor life, nor angels, nor principalities, nor powers, nor things present, nor those to come,
2 Timothy 1:12
For which cause also I suffer these things; but I am not ashamed: for I know on whom I have placed my confidence, and am persuaded that he is mighty to guard my deposit unto the great day.
Hebrews 11:13
All these died in faith, not having received the promises, but beholding them at a great distance, though believing and embracing them, and confessing that they were strangers and sojourners in the land.

He was able

Romans 14:4
Who art thou that judgest another man's servant? To his own master he standeth or falleth; but he shall be established: for God is able to establish him.
Matthew 19:26
And Jesus looking upon them, said unto them, With men this is impossible; but with God all things are possible.
Luke 1:37
For there is nothing impossible with God.
2 Corinthians 9:8
And God is able to make all grace abound towards you; that in every case having always all sufficiency, ye may abound unto every good work:
Hebrews 11:19
reasoning that God was able to raise him up again, even from the dead; from whence also figuratively he had received him.