J.I. Packer writes:

‘The basic difference between the two positions is not, as is sometimes thought, that

• Arminanism follows Scripture while Calvinism follows logic, nor that
• Arminianism knows the love of God while Calvinism knows only his power, nor that
• Arminianism affirms a connection between believing and obeying as a means and eternal life as an end which Calvinism denies, nor that
• Arminianism discerns a bona fide “free offer” of Christ in the gospel which Calvinism does not discern, nor that
• Arminianism acknowledtes human responsibility before God and requires endeavour in the Christian life while Calvinism does not.

No: the difference is that Calvinism recognises a dimension of the saving love of God which Arminianism misses, namely God’s sovereignty in bringing to faith and keeping in faith all who are actually saved.  Arminianism gives Christians much to thank God for, and Calvinism gives them more.’

‘Arminianisms’ in Selected Shorter Writings, Vol 4, p281f. (Formatting added)