His poem to Mrs Dunlop on 'New Year's Day, 1790;' 'A Man's a Man for a' That;' 'A Winter Night;' 'Sketch in Verse;' and 'Verses written in Friar's Carse Hermitage,' all show him to have been a philosophic student of human nature.
A few quotations from letters to his friends will show his philosophical attitude to general matters, as the quotations from his letters showed the clearness and trueness of his philosophy regarding religion, democracy, and brotherhood.
Burns saw man's duty to his fellows and to himself in this life.
In a letter to Robert Ainslie, Edinburgh, 1788, he wrote: 'I have no objection to prefer prodigality to avarice, in some few instances; but I appeal to your observation, if you have not met, and often met, with the same disingenuousness, the same hollow-hearted insincerity, and disintegrative depravity of principle, in the hackneyed victims of profusion, as in the unfeeling children of parsimony. I have every possible reverence for the much-talked-of world beyond the grave, and I wish that which piety believes, and virtue deserves, may be all matter of fact. But in all things belonging to, and terminating in, the present scene of existence, man has serious business on hand. Whether a man shall shake hands with welcome in the distinguished elevation of respect, or shrink from contempt in the abject corner of insignificance; whether he shall wanton under the tropic of plenty, or at least enjoy himself in the comfortable latitudes of easy convenience, or starve in the arctic circle of poverty; whether he shall rise in the manly consciousness of a self-approving mind, or sink beneath a galling load of regret and remorse--these are alternatives of the last moment.'
Since the time of Burns men and women, both in the churches and out of them, have learned to set more store on the importance of living truly on the earth, and have ceased to a large extent to think only of a life to come after death. Men and women are now trying in increasing numbers to make it more heavenly here.
Burns taught a sound philosophy of contentment as a basis for happiness.
He wrote to Mr Ainslie in 1789: 'You need not doubt that I find several very unpleasant and disagreeable circumstances in my business [that of a gauger], but I am tired with and disgusted at the language of complaint at the evils of life. Human existence in the most favourable situations does not abound with pleasures, and has its inconveniences and ills; capricious, foolish man mistakes these inconveniences and ills, as if they were the peculiar property of his own particular situation; and hence that eternal fickleness, that love of change, which has ruined, and daily does ruin, many a fine fellow, as well as many a blockhead; and is almost without exception a constant source of disappointment and misery. So far from being dissatisfied with my present lot, I earnestly pray the Great Disposer of events that it may never be worse, and I think I can lay my hand on my heart and say "I shall be content."'