8:8 testing: Generosity is the natural result of sincere love.
[THE NKJV STUDY BIBLE].
8 Although vested with full apostolic authority (10:8; 13:10), Paul declined to issue directives, preferring rather to request, suggest (cf. v.10), encourage, or appeal (cf. 1 Cor 7:6; 2 Cor 8:6, 10, 17). Spontaneity and warmth would be absent from the Corinthians' giving if coercion were present. But he did see in the enthusiastic generosity of the Macedonian churches a convenient standard for assessing the genuineness of the Corinthians' professed love for him and for all believers, as well as a compelling incentive to arouse them to action.
[NIV BIBLE COMMENTARY Volume 2: New Testament].
[www.sowersoftheword.blogspot.com]. JESUS IS LORD.