Actually you don't agree with the Scripture, except in theory only, else you would not be arguing against it, as 'impractical'.
Instead we should rather believe the Scripture with the heart, and seek to understand what it is saying to the spirit first: the letter of the law kills, but the Spirit gives it life and practical application at all times.
Whatever good works come to hand, such as blessing the helpers, rather than cursing them.
The error is seeing the law of Christ as carnal only, and not spiritually first, that it may become righteousness bodily: works of faith are done within first, that they may be outwardly also:
Thou blind Pharisee, cleanse first that which is within the cup and platter, that the outside of them may be clean also.
The first works of the believers are to purify and guard our hearts from the lust of unrighteous thoughts and vain imagination.
Remember therefore from whence thou art fallen, and repent, and do the first works; or else I will come unto thee quickly, and will remove thy candlestick out of his place, except thou repent.
So long as we can think, intend, and imagine, whether at home or in the field, the devil is tempting us to lust and think unrighteously and uncharitably within the heart: the good fight of enduring such temptation to the end, is the first works of the saints that love God with all the heart and mind and strength.
The works of the body are simply outward proof of the inward works.
O generation of vipers, how can ye, being evil, speak good things? for out of the abundance of the heart the mouth speaketh.
For from within, out of the heart of men, proceed evil thoughts, adulteries, fornications, murders...
Once we read the law and works of faith in Scripture as spiritual first, then we understand how Christ justifies us by our works in the Spirit.
Being pure of heart in the Spirit first, is the only way to walk after the Spirit in the flesh.