The food we eat determines the smell of the belch that follows. The taste of bread that we prepare depends on the kind of flour we use. If you sow seeds in an infertile land, they will not sprout and yield a rich harvest. So also in a person who has dull or evil (rajasic) qualities in their heart, virtuous and pious qualities like worshipping the Lord or compassion cannot flourish. It is therefore necessary for a person to do such things through which the field of their heart can be purified and cleansed. Therefore take courage and move forward on the noble path in the journey of life. The kind of work we engage in will determine the kind of fruits that we get. Hence Lord Krishna has taught in the Gita that the purity of work (karma) is extremely important. Remember God never teaches or does something which does not have deeper spiritual meaning for our well-being.(Summer Roses on Blue Mountains 1976, Ch 10.)