Across this week I came up with a few simple phrases to meditate* on and pray which can be combined into a longer (still short) prayer, which go as follows:
Thank you for the gift, Lord, thank you for the gift
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Forgive me for my sin, Lord, forgive me for my sin
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Shield me from my sin, Lord, shield me from my sin
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Draw me near to you Lord, draw me near to you
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Help me grow in faith, Lord, help me grow in faith
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Open up my eyes, Lord, open up my eyes
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Fill my cup with joy, Lord, fill my cup with joy
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Provide me peace and rest, Lord, provide me peace and rest
The first is thanking God for his gift of life, and that we are able to exist and experience (His) goodness, beauty, love only by Him
The second and third are about sin: firstly seeking forgiveness for sins committed, and then asking for protection from temptation and sin, asking for resolve to resist them in his power and strength
The fourth, fifth and sixth are petitioning that you be made to see Him and to know him
Finally the sixth and seventh are about the results of God's work in our hearts that we yearn for
I want to get something in there simply about how God is good, but haven't thought up anything that fits, and also am a fan of the idea/words of 'singing' and praise, but again nothing has come to mind yet.
But whatever you're feeling, you could try taking one of the above appropriate to your mood and what you're feeling and looking for in your prayer, at that time, close your eyes, focus on your breathing, that is, the involuntary breath of life given to you by God which sustains you as His spirit (which means breath/wind) does and, once you've calmed down, got into a quiet head space, focus on God, pray one of the above, over and over, and, as others have said, with your breathing, contemplate carefully on the meaning and the importance of what you're saying and who you're saying it to with sincerity. *This is what I mean by mediate don't know if that's correct
Also the Lord's prayer is a good starting point as others have said
The Jesus prayer (Lord Jesus Christ, Son of God, have mercy on me, a sinner) is another one I like