God reminds us of his forgiveness often through the symbolism of water. Firstly, he sends rain to everyone, regardless of their attitude towards him.
Secondly, Jesus is the Water of Life, freely available for all who will come, regardless of what they have done. Thirdly, by commanding that we are baptised in water, as a symbol of the inner cleansing that he has done. Because Jesus has washed us clean, we should demonstrate a spirit of thankfulness to Him and reflect this spirit to others in our day to day relationships.
We also have a responsibility to choose to have a pure heart and mind which will be shown by the kind of words and actions we speak and do.