James 3 is about self-control and godly motivation in regards to our speech. James says that how we exercise our tongue will impact "the entire course of your life". He says an uncontrolled tongue is "full of deadly poison" and can bring "enormous damage". Our speech is either motivated by evil, full of jealousy, selfishness, earthly concerns and desires, unspiritual thoughts, and disorder, or it is motivated by godly wisdom, full of love, peace, purity, consideration for others, submission, mercy, sincerity, impartiality, eternal perspective, and goodness.
By His grace, the Holy Spirit guides our hearts and minds and will give us the strength we need to control our tongue, if only we will daily submit and present ourselves to His will and seek in all we do and say to please Him and bring glory to His name.