Commentaries:
Jamieson, Fausset, and Brown
double-minded—literally, "double-souled," the one soul directed towards God, the other to something else. The Greek favors ALFORD'S translation, "He (the waverer, James 1:6) is a man double-minded, unstable," etc.; or better, BEZA'S. The words in this James 1:8 are in apposition with "that man," James 1:7; thus the "us," which is not in the original, will not need to be supplied, "A man double-minded, unstable in all his ways!" The word for "double-minded" is found here and in James 4:8, for the first time in Greek literature. It is not a hypocrite that is meant, but a fickle, "wavering" man, as the context shows. It is opposed to the single eye (Matthew 6:22).
Other Jamieson, Fausset, and Brown entries containing James 1:8:
Psalms 119:113
James 1:8
James 1:11
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