Jude 1:20-21

But you, beloved, build yourselves up on (the foundation of )your most holy faith (continually progress, rise like an edifice higher and higher), pray in the Holy Spirit, and keep yourselves in the love of God, waiting anxiously and looking forward to the mercy of our Lord Jesus Christ (which will bring you) to eternal life. 

The stronger we are in the faith the smaller the mountains look before us. Faith stabilizes our hearts, builds up our minds and conquers our fears. We will know the answer to the problem because of knowledge of the word before it arises. We will know how to answer the devil when he tries to lead us into temptation because we have built our faith on the foundation of Jesus.