Consider this if you want His Kingdom
In order for you to capture in your heart the virtue of loving and serving God above all, and to desire it with all your soul, you must think the countless benefits and gifts you received from God, and your many and countless sins. Keep also in your mind the end of your life, the dreadful judgement of the Lord, the glory of Paradise, and the eternal hell, which all reveal how important is this virtue, and how big is our debt in front of it. This is the first thing that someone needs to consider when desires to obtain His Kingdom which is so beautiful that words cannot express.
From the book Salvation of the Sinners by Monk Agapios Landos of the 17th century
Translated by Dr. Nick Stergiou