When he came to Longbourn, Collins had reconciliation in mind. He wanted to reconcile with the Bennet family by doing something - what is that?

Before dinner, Mr. Collins acknowledges the hardship that the entail presents to the Bennet family and professes his desire to make amends. He claims that he has come to Longbourn "prepared to admire" the young ladies of the household. You can find this in chapter 13 of volume 1.