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Cf. last sentence of 59:9 and the corresponding note [14].
"Fear Allah" combined with "as much as you can" obviously means: "lead lives of self-restraint and righteousness": the usual meaning of Taqwa: see n. 26 to ii. 2.
Charity is meant to help and do good to other people who need it. But it has the highest subjective value for the person who gives it. Like mercy "it blesseth him that gives and him that takes". It purifies the giver's soul: the affection that he pours out is for his own spiritual benefit and progress. Cf. Coleridge: "He prayeth best who loveth best all things both great and small, for the Great God Who loveth us, Who made and loveth all".
Cf. lix. 9. Our worst enemy is within ourselves,-the grasping selfishness which would deprive others of their just rights or seize things which do not properly belong to it. If we can get over this covetous selfishness, we achieve real Prosperity in justice and truth.