‘ Prayer is an interruption of personal ambition.’ I have often thought of these words of Rowland Hogben, my teacher at the China Inland Mission Training Centre in London, where I was studying shortly before sailing for China in 1934. They remind me that a busy life is no excuse for lack of prayer. I would never admit that I considered prayer less important than my other activities, but in practice I have so often found myself postponing or hurrying through a time of prayer because other things needed to be done. I was in effect demonstrating that I regarded my efforts as being more important than waiting upon God. A time spent in prayer is an expression of my faith and dependence on God, and a recognition of the fact that I cannot fulfil his will apart from the grace of the Lord Jesus and the power of the Holy Spirit.
Source: David H. Adeney, editor D. A. Carson, Teach Us to Pray: Prayer in the Bible and the World. 308.