Should we pray with few words, or should we pray with many words?
Solomon the wise tells us to pray with few words (Ecclesiastes 5:2–3).
And Jesus himself teaches us to pray with few words (Matthew 6:7–8).
But Paul tells us to pray without ever stopping (1 Thessalonians 5:17).
Well in my view the answer to this is that pray thoughtfulness. Continue to pray to God in terms of giving thanks to Him or praising Him or even asking for something from your Father in heaven. Use your words wisely is what "thoughtfulness" means.
When you are thinking while you pray you give your entire self to God.
God wants our undivided attention while we pray to Him.
So you can be both heartfelt and succinct.