Jamieson, Fausset and Brown on Ecclesiastes 11:4

4. Therefore sow thy charity in faith, without hesitancy or speculation as to results, because they may not seem promising (Ec 9:10). So in Ec 11:1, man is told to "cast his bread corn" on the seemingly unpromising "waters" (Psa 126:5, 6). The farmer would get on badly, who, instead of sowing and reaping, spent his time in watching the wind and clouds.