'Adhere to righteousness even though you will not be able to do all the good acts

It was narrated that Thawban, may Allah be pleased with him, said:The Messenger of Allah, may the peace and blessings of Allah be upon him, said:

'Adhere to righteousness even though you will not be able to do all the good acts. Know that the best of your deeds is the prayer and that none but a believer maintains his state of ablution.