Arise, then, and make steadfast your feet, and make ye amends for that which hath escaped you, and set then yourselves towards His holy Court, on the shore of His mighty Ocean, so that the pearls of knowledge and wisdom, which God hath stored up within the shell of His radiant heart, may be revealed unto you.
(Bahá’u’lláh, The Proclamation of Bahá’u’lláh, p. 8-9)
You have asked about the need “to make amends for transgressions of a personal nature”. As you know, each individual must resolve his own tests according to the promptings of his conscience. However, it sometimes happens that negative feelings about oneself become an obstacle to successfully passing one’s spiritual tests by making it difficult to believe in one’s own nobility. To this effect, Bahá’u’lláh assures us: Veiled in My immemorial being and in the ancient eternity of My essence, I knew My love for thee; therefore I created thee, have engraved on thee Mine image and revealed to thee My beauty.
(The Universal House of Justice, 1985 Dec 02, Child Abuse, Psychology and Knowledge of Self)
… if we spontaneously desire to acknowledge we have been wrong in something and that we have some fault of character, and ask another person’s forgiveness or pardon, we are quite free to do so. The Guardian wants to point out, however, that we are not obliged to do so. It rests entirely with the individual.
(From a letter written by the Universal House of Justice to a National Spiritual Assembly, 19 March, 1973)