Mettã is likened to a Mother's Love:

 

The Blessed Buddha once said:
As a mother would even with risk her own life to protect her only child,
so let us cultivate immeasurable loving-kindness towards all living beings!

 

On this mighty Friendly Goodwill (Mettā):
Metta, Buddha on Noble Friendship, Good_Friendship, Genuine_Goodwill,
Selfless Friendship is Sweetest, All Embracing Kindness, Blazing Friendliness,

United in Harmony, Goodwill Encore, United_in_Harmony, The Good Friend,
Blazing & Bright, Kalyanamitta, Friendliness Frees, Blazing_Friendliness,

Blazing_&_Bright, Brahma vihaara, Infinite_Friendliness, Unique_Unity,

Good-Will_Again, Bon_Benevolence, Good_Friendship, The_Good_Friend,

Goodwill_Encore, What_is_Wrong, Universal_Friendliness, Blazing_Goodwill,
Infinite_and_Divine_Classic, Calm_Kindness, Released_by_GoodWill,

Friendly_plus_Unselfish_equals_Honourable, The_Grace_of_Goodwill,
All-Embracing_Kindness, Unsurpassable_Radiance, Safe_Medicine,

Symbiotic_Sympathy, The-Effective_Saw.