Do nothing out of selfish ambition or vain conceit. Rather, in humility value others above yourselves, not looking to your own interests but each of you to the interests of the others.
As wonderful as it may seem to help others, the Lord asks that it be done with humility, not for the pat on the back or the kudos for our pride. We sometimes find it hard to keep good works anonymous, but when possible, that is a very pleasing way to serve God. Many times, it's simply impossible to be anonymous in your efforts. Just make sure your motive is pure and God will be delighted with your service.