The formal offerings to the Deity are of little worth, unless the mind be bent in devotion. How beautiful does Raidas express himself on this point!
राम मैं पूजा कहा चढ़ाऊँ । फल अरु फूल अनूप न पाऊँ ॥टेक॥
थन तर दूध जो बछरू जुठारी । पुहुप भँवर जल मीन बिगारी ॥१॥
मलयागिर बेधियो भुअंगा । विष अमृत दोउ एक संगा ॥२॥
मन ही पूजा मन ही धूप । मन ही सेऊँ सहज सरूप ॥३॥
पूजा अरचा न जानूँ तेरी । कह रैदास कवन गति मोरी ॥४॥
Sant Raidas by Swami Sivananda
What shall I offer Thee for worship, O Rama? – Fruits and flowers are rare, I find not.
The milk in the cow's udder is defiled by the calf tasting.
The 'Bhramara' hath contaminated the flower, and the fish the water.
The serpent entwines the sandal tree: – Poison and nectar are to be found side by side.
In the mind is the worship: In the mind, the incense: – In the mind I attend on Thy natural Form.
I know not Thy worship or oblation. – Says Raidas: What shall be my fate?
Please check these: Excerpts from a discourse by our Sri Sri Muralidhara Swamiji
God gives whatever is required (by His devotee), removes whatever is not needed, leads the devotee in the path suited to him/her; Since Bhagavãn takes utmost interest in the devotee's needs the latter will not earn/attain any 'siddhi'