"On a certain occasion, I saw a person about to commit a mortal sin. I asked the Lord to send me the greatest torments so that that soul could be saved. Then I suddenly felt a terrible pain of a crown of thorns on my head. It lasted for quite a long time, but that person remained in the Lord's grace. O my Jesus, how very easy it is to become holy; all that is needed is a bit of good will. If Jesus sees this little bit of good will in the soul, he hurries to give Himself to the soul, and nothing can stop Him, neither shortcomings nor falls absolutely nothing. Jesus is anxious to help that soul, and if it is faithful to this grace from God, it can very soon attain the highest holiness possible for a creature here on earth. God is very generous and does not deny His grace to anyone. Indeed he gives more than what we ask of Him. Faithfulness to the inspirations of the Holy Spirit - that is the shortest route" 
(Saint Faustina's Diary 291)