30 But perhaps He may be thought to have feared to the extent that He prayed that the cup might be removed from Him: Abba, Father, all things are possible unto You: remove this cup from Me. To take the narrowest ground of argument, might you not have refuted for yourself this dull impiety by your own reading of the words, Put up your sword into its sheath: the cup which My Father has given Me, shall I not drink it ? Could fear induce Him to pray for the removal from Him of that which, in His zeal for the Divine Plan, He was hastening to fulfil? To say He shrank from the suffering He desired is not consistent. You allow that He suffered willingly: would it not be more reverent to confess that you had misunderstood this passage, than to rush with blasphemous and headlong folly to the assertion that He prayed to escape suffering, though you allow that He suffered willingly?
Source: On the Trinity (New Advent)