Theology is...

[Theology] may be defined [as] the doctrine or science of the truth which is according to godliness, and which God has revealed to man that he may know God and divine things, may believe on Him and may through faith perform to Him the acts of love, fear, honor, worship and obedience, and obtain blessedness from Him through union with Him, to the divine glory...On this account, theology is not a theoretical science or doctrine, but a practical one, requiring the action of the whole man, according to all and each of it's parts -- an action of the most transcendent description, answerable to the excellence of the object as far as the human capacity will permit.

--James Arminius (October 10, 1560 – October 19, 1609), The Works of James Arminius, vol. 2.