Main point summary
Uncontrolled speech can indicate that a person does not have godly character, since God's standard of piety is characterized by selfless service and purity of life.
If any man among you seem to be religious,
If someone appears to you to be a religious, pious person
and bridleth not his tongue,
While he is not controlling his speech
but deceiveth his own heart,
But is instead convincing himself that he is truly pious and godly
this man's religion is vain.
Then we can conclude that this person's type of piety is empty and useless, devoid of true righteousness.
Pure religion and undefiled before God and the Father is this,
We can come to this conclusion , because we know that God's idea of true piety and godly character consists of this:
To visit the fatherless and widows in their affliction,
In visiting orphans and widows, comforting them in their grief
and to keep himself unspotted from the world.
And also in guarding yourself from the corrupting influences of this age.
James 1:26-27 KJV
26 If any man among you seem to be religious, and bridleth not his tongue, but deceiveth his own heart, this man's religion is vain. 27 Pure religion and undefiled before God and the Father is this, To visit the fatherless and widows in their affliction, and to keep himself unspotted from the world.
We must be careful not to allow ourselves to be deceived by first appearances -- not everyone who looks like a good Christian is actually so. - cf. Matt. 7:20 God's idea of godly character consists of humble service to the forgotten members of society and constant vigilance in maintaining our purity.