When I became a Bahá'í in the 90s, perhaps the second deliberate change I made (prayer being the first) was to act with greater respect and appreciation towards my parents. I have long remembered that there was a particular passage that prompted this change; the "Bahá'í Faith" quote service on Facebook has brought that long-sought quotation back to me today:
"The fruits that best befit the tree of human life are trustworthiness and godliness, truthfulness and sincerity; but greater than all, after recognition of the unity of God, praised and glorified be He, is regard for the rights that are due to one's parents. This teaching hath been mentioned in all the Books of God, and reaffirmed by the Most Exalted Pen. Consider that which the Merciful Lord hath revealed in the Qur'án, exalted are His words: "Worship ye God, join with Him no peer or likeness; and show forth kindliness and charity towards your parents…" Observe how loving-kindness to one’s parents hath been linked to recognition of the one true God!" Bahá'u'lláh, The Kitáb-i-Aqdas, paragraph 106.
How did this change manifest itself? The only particular act I can remember is that I began frequently doing the dishes when at home :-).