"That you may know the certainty of those things in which you were instructed." Luke 1:4 (Read Luke 1:1-4, the purpose of Luke's gospel.)

Let's see what Scripture tells us as to what we can be certain of as Believers. We see in "Vine's Expository Dictionary of Old and New Testament Words" the word here in the Greek is:
"ASPHALEIA (noun), primarily, not liable to fall, steadfast, firm, hence denoting safety."
ASPHALES (adjective), certain, safe and sure.

Scripture tells us of comforting certainties-- Sure promises:
"Blessed be the LORD, who has given rest to His people Israel, according to all that He promised. There has not failed one word of all His good promise, which He promised through His servant Moses." 1 Kings 8:56

Sure foundations:
"Therefore thus says the LORD God:
'Behold, I lay in Zion a stone for a foundation, A tried stone, a precious cornerstone, a sure foundation; Whoever believes will not act hastily.'" Isaiah 28:16

Assured acceptance:
Jesus speaking in John 6:37,
"All that the Father gives Me will come to Me, and the one who comes to Me I will by no means cast out."

Divine love:
"For I am persuaded that neither death nor life, nor angels nor principalities not powers, nor things present nor things to come, nor height nor depth, nor any other created thing, shall be able to separate us from the love of God which is in Christ Jesus our Lord." Romans 8:38-39

Assured immortality:
"For we know that if our earthly house, this tent, is destroyed, we have a building from God, a house not made with hands, eternal in the heavens."
2 Corinthians 5:1

Eternal anchorage:
"This hope we have as an anchor of the soul, both sure and steadfast, and which enters the Presence behind the veil, where the forerunner has entered for us, even Jesus." Hebrews 6:19-20

Scripture also tells us of uncertainties! (Things that an unbeliever may depend on.)
Beauty:
"When with rebukes You correct man for iniquity, You make his beauty meld away like a moth; Surely every man is vapor. Selah" Psalm 39:11

Men's promises:
"Do not put your trust in princes,
In mortal men, who cannot save." Psalm 146:3

Riches:
"Will you set your eyes on that which is not?
For riches certainly make themselves wings; They fly away like an eagle toward heaven." Proverbs 23:5

The future:
"Do not boast about tomorrow,
For you do not know what a day may bring forth." Proverbs 27:1

Life:
"Whereas you do not know what will happen tomorrow. For what is your life? It is even a vapor that appears for a little time and then vanishes away." James 4:14

Scripture tells of other sobering certainties that face the unrepentant sinner. I will suggest one that would be good to read. Matthew 25:31-33 tells of the separation of the righteous and the unrighteous. Read the whole of Vs. 31-46.

Thank you Father for the certainties You have given us in Your safe, sure and steadfast word. We praise, honor and glorify Your Holy Name. Amen