Vigilance is watchfulness, alertness, or attentiveness. Vigilance in working toward eternal life is most difficult during the easy times. When we have blessed for so long, then it is easiest to be less diligent.
One important way to sustain and increase our vigilance at all times is to always remember the Lord. When we continually reflect on the many blessings and the mercy He has given to us and to all His children, we can't help but develop a deeper humility and appreciation. This act also brings us closer to the Spirit, which motivates us to action.