(18) Praying always with all prayer and supplication in the Spirit, and watching thereunto with all perseverance and supplication for all saints;
(19) And for me, that utterance may be given unto me, that I may open my mouth boldly, to make known the mystery of the gospel,
Not only does Paul exhort the believers to pray for the saints, but he also requests prayers for himself.
Utterance - NT:3056 logos (log'-os); from NT:3004; something said (including the thought); by implication a topic (subject of discourse), also reasoning (the mental faculty) or motive; by extension, a computation; specifically (with the article in John) the Divine Expression (i.e. Christ):
Boldly - NT:1722 en (en); a primary preposition denoting (fixed) position (in place, time or state), and (by implication) instrumentality (medially or constructively), i.e. a relation of rest (intermediate between NT:1519 and NT:1537); "in," at, (up-) on, by, etc.:
NT:3954 parrhesia (par-rhay-see'-ah); from NT:3956 and a derivative of NT:4483; all out-spokenness, i.e. frankness, bluntness, publicity; by implication, assurance:
Though Paul was known for his boldness, he still requested prayer. Taking his example, we should pray for the preachers and pastors we know: that God would give them utterance and boldness to declare the Gospel. We cannot pray too much for the men of God that we know.