Scripture suggestions:
Strength
Genesis 4:12
Exodus 15:2  -- the Lord is my strength and song
Judges 6:14, 8:21, 16:6
I Samuel 28:20
Job 6:12, 21:23
​Psalm 28:7  -  the Lord is my strength and my shield
            46:1   -  God is our refuge and strength
            84:7  -  They go from strength to strength
​Isaiah 40:29  -- He gives strength to the weary

Mark 12:30  -- Mind, and with all your strength
I Peter 4:11  --  by the strength which God supplies
Revelation 1:16 -- sun shining in its strength


Strengthen -- fortify
Deuteronomy 3:28 -- But commission Joshua, and encourage and strengthen him
Judges 16:28 -- "Sovereign Lord, remember me. Please, God, strengthen me just once more,"
Isaiah 35:3 -- Strengthen the feeble hands, steady the knees that give way.
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Luke 22:32   (Jesus speaking) "And when you have turned back, strengthen your brothers."
Colossians 1:11  -- being strengthened with all power according to his glorious might
2 Thessalonians 2:17 -- encourage your hearts and strengthen you in every good deed and word.