"And He gave them their request, But sent leanness into their soul." Psalm 106:15
There are a great many people who do not pray because they simply do not feel any sense of need. One of the great signs that the Holy Spirit is in us is that we realize that sense of absolute need. The Spirit will awaken that sense of need whenever life challenges us. The Spirit may bring us a sense of fullness, yet we realize how empty we have been, and in that emptiness the Spirit directs us to prayer.
When we learn how to pray in the Spirit, there may come a sense of restraint. Never push beyond, determining in your mind that it is God's will and I will stick to it. Remember the above scripture, God may be reluctant but grant your request anyway. Allow the Spirit of God to teach you, He is your source, He knows your need, and do not grieve Him with your determination. Beware; if you are ever free from that sense of need, it may be that you have become satisfied with the way you are.
If you are truly abiding in Jesus Christ you will learn to ask for what He wants you to ask for, whether we are conscious of doing so or not. Hallelujah, Amen and Amen.