In John 6:1-21 Jesus' friends were used by God as part of a miracle.
It's difficult to catch anything with clenched fists, but soft open hands can receive many things. The great fielders in baseball and receivers in football are legends in no small part because of what they can do with open hands.
God gives many good blessings to us; and a recent lesson for me me is to keep my hands open to keep on giving that I might later receive to give again. It's not a simple formula like giving guarantees receiving. Rather it's simple faith receiving from God and giving away as God keeps on giving that opens us up as channels through who God works to build his kingdom.