Romans 4:21

and was fully convinced that what He had promised, He was able to carry out.

Hebrews 11:19

[So], he reasoned that God was able to raise up [Isaac] from the dead, which, in a sense, he did receive him back [from the dead].

2 Timothy 1:12

For I am suffering these things [See verse 8] for this reason [i.e., because of being a Gospel preacher]. Yet I am not ashamed because I know whom I have believed in [i.e., Jesus], and I am convinced that He is able to guard what I have entrusted to Him [i.e., Paul's spiritual well-being] until that day [i.e., the day of judgment].

2 Timothy 1:12

For I am suffering these things [See verse 8] for this reason [i.e., because of being a Gospel preacher]. Yet I am not ashamed because I know whom I have believed in [i.e., Jesus], and I am convinced that He is able to guard what I have entrusted to Him [i.e., Paul's spiritual well-being] until that day [i.e., the day of judgment].

2 Timothy 1:12

For I am suffering these things [See verse 8] for this reason [i.e., because of being a Gospel preacher]. Yet I am not ashamed because I know whom I have believed in [i.e., Jesus], and I am convinced that He is able to guard what I have entrusted to Him [i.e., Paul's spiritual well-being] until that day [i.e., the day of judgment].

2 Timothy 1:12

For I am suffering these things [See verse 8] for this reason [i.e., because of being a Gospel preacher]. Yet I am not ashamed because I know whom I have believed in [i.e., Jesus], and I am convinced that He is able to guard what I have entrusted to Him [i.e., Paul's spiritual well-being] until that day [i.e., the day of judgment].

Matthew 19:26

Jesus looked at them and said, "This would be impossible with men, but everything is possible with God."

Luke 1:37

For nothing that God says [will happen] is impossible."

Luke 1:45

And she who [has] believed [the promises made by the Lord] is [truly] blessed, for the things which have been spoken to her [i.e., to Mary] by the Lord will [indeed] be fulfilled."

Romans 8:38

For I am convinced that neither death, nor [the trials of] life, nor [evil] angels, nor [evil] rulers, nor present or future [circumstances], nor [evil] powers,

Romans 14:4

Who [do you think] you are, to pass judgment on someone else's household servant? He stands [approved] or falls [into disapproval] before his own Master [only]. Yes, [surely] he will stand [approved], for the Lord is capable of helping him to stand.

2 Corinthians 9:8

And God is able to provide you with abundant gifts, so that you will always have plenty of everything, and that you will also have plenty for doing every good deed.

Hebrews 11:13

These people [all] continued to have faith until they died, [even though] they had not obtained [all] the things God had promised, but had [only] seen them and welcomed them from a distance. And they had confessed to being strangers and aliens on earth.

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 convinced that neither death, nor [the trials of] life, nor [evil] angels, nor [evil] rulers, nor present or future [circumstances], nor [evil] powers,
2 Timothy 1:12
For I am suffering these things [See verse 8] for this reason [i.e., because of being a Gospel preacher]. Yet I am not ashamed because I know whom I have believed in [i.e., Jesus], and I am convinced that He is able to guard what I have entrusted to Him [i.e., Paul's spiritual well-being] until that day [i.e., the day of judgment].
Hebrews 11:13
These people [all] continued to have faith until they died, [even though] they had not obtained [all] the things God had promised, but had [only] seen them and welcomed them from a distance. And they had confessed to being strangers and aliens on earth.

He was able

Romans 14:4
Who [do you think] you are, to pass judgment on someone else's household servant? He stands [approved] or falls [into disapproval] before his own Master [only]. Yes, [surely] he will stand [approved], for the Lord is capable of helping him to stand.
Matthew 19:26
Jesus looked at them and said, "This would be impossible with men, but everything is possible with God."
Luke 1:37
For nothing that God says [will happen] is impossible."
2 Corinthians 9:8
And God is able to provide you with abundant gifts, so that you will always have plenty of everything, and that you will also have plenty for doing every good deed.
Hebrews 11:19
[So], he reasoned that God was able to raise up [Isaac] from the dead, which, in a sense, he did receive him back [from the dead].