Charles Haddon Spurgeon said this quote

If a man were to sow a field, he could not excuse his neglect by saying that it would be useless to sow unless God caused the seed to grow. He would not be justified in neglecting tillage because the secret energy of God alone can create a harvest. No one is hindered in the ordinary pursuits of life by the fact that unless the Lord build the house they labor in vain that build it.