They are strong and powerful, who execute God’s word.

They are strong and powerful, who execute God’s word.
“And the Lord utters His voice before His army, for His host is very great, and [they are] strong and powerful who execute [God’s] word. For the day of the Lord is great and very terrible, and who can endure it?” 
Joel 2:11 (AMPC)
You obey God’s Word, your strength, and might in Him increases.
HE becomes your strength and refuge based on the dimensions of your obedience.
“…the people who know their God shall prove themselves strong and shall stand firm and do exploits [for God].” Daniel 11:12 (AMPC)
To remain relevant and above, reproach actively decide to obey God’s command.
“Then, I’ll never be ashamed, for I take strength from all your commandments.” Psalm 119:6 (TPT)
“How can a young man stay pure? Only by living in the word of God and walking in its truth.” Psalm 119:9 (TPT)
How much of His commandments have you carried out to date?
To continue to prosper and be relevant for His purpose and Glory live a life of obedience to His Word.
“Beloved friends, what should be our proper response to God’s marvelous mercies? I encourage you to surrender yourselves to God to be his sacred, living sacrifices. And live in holiness, experiencing all that delights his heart. For this becomes your genuine expression of worship.” 
Romans 12:1 (TPT)
Remain relevant and reverent to God by joyfully obeying Him in all areas of your life.
Do what HE instructs you to do today.
That is the real source of strength and power.