C.S. Lewis, in “Learning in Wartime,” a sermon he gave at Oxford in 1939.
There are always plenty of rivals to our work. We are always falling in love or quarreling, looking for jobs or fearing to lose them, getting ill and recovering, following public affairs. If we let ourselves, we shall always be waiting for some distraction or other to end before we can really get down to our work. The only people who achieve much are those who want [their goal] so badly that they seek it while the conditions are still unfavorable. Favorable conditions may never come.
Quote via Elise Amyx
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