Facing difficulties in prayer
In positive terms, the battle against the possessive and dominating self requires vigilance, sobriety of heart. When Jesus insists on vigilance, he always relates it to himself, to his coming on the last day and every day: today. The bridegroom comes in the middle of the night; the light that must not be extinguished is that of faith: "'Come,' my heart says, 'seek his face!'"
Source: Catechism of the Catholic Church (Vatican.va)