The answer
It means that to anyone who has faith, and a love for doing good work, or to anyone who does good, God will give a blessing, in order to increase that person's faith or good works, or both.
But anyone who does not have faith, and whose actions are carried out without faith, will have those actions taken away from him, and they will have no value because they were not done in faith.
The same goes for a person who doesn't do good works, and whose faith is without works, to which one could apply the
words: "Faith by itself, if it does not have works, is dead." (James 2:17) This 'dead' faith will be taken away from that person. This faith which is just in name, or just something intellectual, or formal, will be taken away from him.
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Thrice-Blessed Pope Shenouda III of Blessed Memory