In every age, God's truth has been assailed by error. It was so in the days of the Apostles, it is so today. In Apostolic times some taught that justification was by the works of the Law (Acts 15:5), others claimed that the resurrection was past (2 Tim. 2:17-18), others again, that Jesus Christ had not come in the flesh (1 John 4:3), and so forth. The Apostles vigorously challenged the errors, and warned that their false doctrine was destructive of faith. Paul pronounced a curse upon those teaching these errors (Gal. 1:8), and urged upon believers the need to take heed to their conduct, "and to their doctrine," for by so doing they would save themselves, and those who heard them (1 Timothy 4:16). The Lord Jesus taught that acceptable worship is only that offered "in spirit and in truth" (John 4:23). Therefore, there is a need to seek out truth, and to carefully sift out error. Unfortunately, many doctrines taught by Christendom today are erroneous. Some of these, like the doctrine of the mortality of man, we have already dealt with in the course of our studies. Others, we propose to consider in this section, though we will not be able to treat with all. The reader owes it to himself and to God to carefully discriminate between truth and error, even in relation to teaching which he has been taught to revere. God's word must be magnified above all else (Ps. 138:2). "Let God be true" even if every man be "made a liar" (Romans 3:4).