John Chrysostom

"Strengthened with all power." He is here speaking of trials and persecutions. We pray that ye might be filled with strength, that ye faint not for sorrow, nor despair. "According to the might of His glory." But that ye may take up again such forwardness as it becometh the power of His glory to give. "Unto all patience and long-suffering." What he saith is of this sort. …

Homily on Colossians 2 ↗

Theophylact of Ohrid

We pray that you may attain perfection, "being strengthened with all power." Against what? Against temptations and persecutions, so that you do not become careless and do not fall into despair. To grant you such power as is fitting for Him to give, that is, ineffable and boundless, such as it is possible for a person to receive. Here is great encouragement. For he did not say: according to power, but "according to might," which is greater, as if saying: everywhere His glory is mighty. …

Commentary on Colossians ↗

Thomas Aquinas

Then he mentions their standing up under evils, for to live a virtuous life it is not enough just to know and to will; one must also act in spite of opposition: and this cannot be done without a patient endurance of evils. And so he says, may you be strengthened with all power: "Rich in power" (Sir 44:6). Such power, or virtue, comes from God; and so he says, according to his glorious might: "Be strong in the Lord" (Eph 6:10). …

Commentary on Colossians ↗