"Every activity, however insignificant or small, can be sublimated into worship, provided it is performed in a true spirit of prayerfulness, self-dedication and self-surrender.
The whole Universe, then, transforms into the Cosmic Temple and God, the Omnipresent Supreme Lord, accepts all our actions, physical and mental, like consecrated offerings.
It is not the flowers or fruits which are accepted by the Lord, but the genuine sincerity, devotion, faith and self-surrender, which are more valuable to Him than all the materials of worship.
Therefore the Lord advises us to surrender ourselves with all our actions completely at His sacred feet and cross the ocean of Samsara by elevating work into worship, treading the path of Dedication and Consecration:
यत्करोषि यदश्नासि यज्जुहोषि ददासि यत् ।
यत्तपस्यसि कौन्तेय तत्कुरुष्व मदर्पणम् ॥ ९-२७॥
yatkaroShi yadashnAsi yajjuhoShi dadAsi yat |
yattapasyasi kaunteya tatkuruShva madarpaNam || 9-27||
“Whatever thou doest, whatever thou eatest, whatever thou offerest in sacrifice, whatever thou givest away, whatever austerity thou practisest, О son of Kunti, do thou as an offering unto Me." shrImadbhagavadgItA, 9.27
Cited from "Kalyana-Kalpataru", 1935 issue
"KarmaYoga and The Bhagavad-Gita" article by Swami AsangaAnanda