'Strength' in the Bible

For we would not, brethren, have you ignorant of our trouble which came to us in Asia, that we were pressed out of measure, above strength, insomuch that we despaired even of life:

But in everything making it clear that we are the servants of God, in quiet strength, in troubles, in need, in sorrow,

And he said unto me, My grace is sufficient for thee: for my strength is made perfect in weakness. Most gladly therefore will I rather glory in my infirmities, that the power of Christ may rest upon me.

So I am well pleased with weaknesses, with insults, with distresses, with persecutions, and with difficulties, for the sake of Christ; for when I am weak [in human strength], then I am strong [truly able, truly powerful, truly drawing from God’s strength].

Truly the signs of an Apostle were done among you in quiet strength, with wonders and acts of power.