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The Nectar of Devotion
devotional service in self-surrender are two difficult processes. Therefore such relationships with the Lord can very rarely be seen. Only for the advanced devotees are these two processes easily executed. The purport is that it is very rare to see surrender which is mixed with sincere ecstatic devotion. One must give himself completely to the will of the Lord.
In the Eleventh Canto of  Śrīmad-Bhāgavatam , 40th verse, 11th Chapter, Lord Kṛṣṇa tells Uddhava: “My dear friend, if someone offers Me the best thing in his possession, or anything which is very pleasing to him, he will be eternally benefitted.”
In the  Nārada-pañcarātra  there is a statement of how one can act in all spheres of life for the satisfaction of the Lord. It is stated there that a person who is actually in devotional service must be engaged in all kinds of activities, those prescribed in the revealed scriptures and also those which are accepted for livelihood. In other words, a devotee should engage himself not only in the prescribed duties of devotional service which are mentioned in the revealed scriptures, but he should also perform the duties of his practical life in Kṛṣṇa consciousness. For example, a devotee who has a great establishment, or factory, may offer the fruits of such a material possession for the service of the Lord.
In the  Hari-bhakti-vilāsa  there is the following statement about self-surrender: “My dear Lord, a person who has surrendered himself unto You, and who is in firm conviction that he is Yours, and actually acts in that way by his body, mind and words, can actually relish transcendental bliss.”
In the  Nṛsiṁha Purāṇa , Lord Nṛsiṁhadeva says: “Anyone who prays unto Me and takes shelter from Me becomes My ward, and I protect him always from all sorts of calamities.”
Serving Trees such as the Tulasī
In the  Skanda Purāṇa  there is a statement eulogizing the  tulasī  tree as follows: “Let me offer my respectful obeisances unto the  tulasī  tree, which can immediately vanquish volumes of sinful activities.