Quoting R.T. Kendall:
Prayer can no more be divorced from worship than life can be divorced from breathing. If we follow his impulse, the Holy Spirit will always lead us to pray. When we allow Him to work freely, he will always bring the Church to extensive praying. Conversely, when the Spirit is absent, we will find excuses not to pray. We may say, “God understands. He knows I love him. But I’m tired…I’m so busy…It’s just not convenient now.” When the Spirit is absent, our excuses always seem right, but in the presence of the Spirit our excuses fade away.