Effectual communication is of paramount importance for all believers.
EFFECT'UAL, adjective Producing an effect, or the effect desired or intended; or having adequate power or force to produce the effect. The means employed were effectual According to the gift of the grace of God given me by the effectual working of his power. Ephesians 3:7.
ED'IFYING, participle present tense Building up in christian knowledge; instructing; improving the mind.
Wherefore comfort yourselves together, and edify one another, even as also ye do. 1 Thessalonians 5:11 Let no corrupt communication proceed out of your mouth, but that which is good to the use of edifying, that it may minister grace unto the hearers. Ephesians 4:29 Be not deceived: evil communications corrupt good manners. 1 Corinthians 15:33 Mortify therefore your members which are upon the earth; fornication, uncleanness, inordinate affection, evil concupiscence, and covetousness, which is idolatry:  For which things' sake the wrath of God cometh on the children of disobedience:  In the which ye also walked some time, when ye lived in them.  But now ye also put off all these; anger, wrath, malice, blasphemy, filthy communication out of your mouth. Colossians 3:5-8 That the communication of thy faith may become effectual by the acknowledging of every good thing which is in you in Christ Jesus. Philemon 1:6