As we have seen, there is sometimes a big difference between what God is actually asking of us, and what we imagine He is asking. We won’t have the grace to do what God is not asking of us. But for what He is asking, He has promised us His grace: God grants what He commands. When God inspires us to do something (if it really is God who is the source of the inspiration), at the same time He supplies the ability to do it, even if it is beyond our capacity or scares us at the start. Every motion that comes from God brings both the light to understand what God intends, and the strength to accomplish it: light that illuminates the mind, and strength that gives power to the will.

The Marvelous Power Of The Cross | Pope Leo The Great
Our understanding, which is enlightened by the Spirit of truth, should receive with purity and freedom of heart the glory of the cross as it shines in heaven and on earth. It should see with inner vision the meaning of the Lord's words when he spoke of the imminence...