"And pray in the Spirit ..."

One of the useful habits Selwyn Hughes encourages Christians to develop is to keep a notebook with your Bible and to jot down the questions that come to us as we read. Yesterday I made the following entry:
Eph. 6:18 "and pray in the Spirit on all occasions with all kinds of prayers and requests ..." Wondering what that phrase, 'pray in the Spirit' means. Spirit is capitalized - does it therefore mean the Holy Spirit?

Today I was thinking about this again, and also about what it means to worship God 'in spirit and in truth'. I tried googling this phrase and came across an article by Mike Taylor of his teaching on this very subject as presented to NFI Walworth in February 2000.
http://www.miketaylor.org.uk/xian/worship.html

Heartened by this success, I then googled the phrase "and pray in the Spirit" and came across some more helpful teaching, suggesting that praying in the spirit doesn't necessarily mean praying in tongues (that interpretation had crossed my mind), but rather contrasts with 'praying in the flesh' - in other words, what is behind our prayers? Are we praying for show? Is it prompted by some sort of mindless religious habit? Or is our prayer prompted by the Holy Spirit, with our mind conformed to the Spirit of grace and truth, in all humility and sincerity?

It seems that praying in the Spirit might be in tongues or it might be in our own language, but it is prayer that is guided by the Holy Spirit, who helps us in our weakness. The Holy Spirit knows the issues in our lives, and knows our needs. He also knows God's perfect will for us and intercedes for us. When we sing praises to God and worship Him out loud, or invite the Holy Spirit to fill us and guide us in prayer and praise, we are drawing near to God and we are promised that when we draw near to God, He will draw near to us. Prayer in the Spirit will be characterized by the joy and power of the Holy Spirit.

A wise man once said that before we open our mouths to speak, it is helpful to ask ourselves three questions:

1) Is what I am about to say true?
2) Am I going to say it in such a way that will build up and not tear down? This could relate to a situation or a person. (So often the language we use can be very destructive, and indeed the very way we use it helps create the 'meaning ' of what is going on).
3) If I am speaking about another person who is not present, would I be willing to say it in their presence?

I think these three questions are also pertinent when we are speaking to God.