Sam Crabtree recently commented on his blog,
Mothers Day is not primarily about being a mother and receiving honor, but thanking God for the mother he gave you, and giving honor. The people giving honor should include all moms. Persons receiving honor as moms should also be giving honor for their God-given moms.
Mothers are a gift from God, and every last person has one. So Mother's Day is really a holiday for everyone, a day for thanking God for his goodness in giving us mothers, and an occasion for letting that gratitude play itself out in tangible expressions of special honor.
From the Mother's Day sermons John Piper has preached, here are a few you may find particularly relevant today, whether you're a mother or not: