p124 Meditation on love is very powerful. Even if our concentration is not very strong we accumulate a vast amount of merit.

Meditation on love is very powerful. Even if our concentration is not very strong we accumulate a vast amount of merit. By meditating on love we create the cause to be reborn as a human or a god, to have a beautiful body in the future, and to be loved and respected by many people. Love is the great protector, protecting us from anger and jealousy, and from harm inflicted by spirits.

Venerable Geshe Kelsang Gyatso Rinpoche,
The New Eight Steps to Happiness