The highest summit of spiritual perfection is knowledge of the Supreme Personality of Godhead. Unless one is firmly convinced of the different opulences of the Supreme Lord, he cannot engage in devotional service. Generally people know that God is great, but they do not know in detail how God is great. Here are the details. If one knows factually how God is great, then naturally he becomes a surrendered soul and engages himself in the devotional service of the Lord. When one factually knows the opulences of the Supreme, there is no alternative but to surrender to Him. This factual knowledge can be known from the descriptions in Śrīmad-Bhāgavatam and Bhagavad-gītā and similar literatures.
(Bhagavad-Gita---10:7---purport).

In the Vedic literature, charity given to a person engaged in spiritual activities is recommended. There is no recommendation for giving charity indiscriminately. Spiritual perfection is always a consideration.
(Bhagavad-Gita---17:20---purport).

Engagement in such worship of the Deity, under the direction of a bona fide spiritual master, will greatly help the householders to purify their very existence and make rapid progress in spiritual knowledge. Simple theoretical book knowledge is not sufficient for a neophyte devotee. Book knowledge is theoretical, whereas the arcana process is practical. Spiritual knowledge must be developed by a combination of theoretical and practical knowledge, and that is the guaranteed way for attainment of spiritual perfection. The training of devotional service for a neophyte devotee completely depends on the expert spiritual master who knows how to lead his disciple to make gradual progress towards the path back home, back to Godhead.
(Srimad Bhagavatam---2:3:22---purport).

Out of the sādhana devotees, there are mixed and pure devotees. The mixed devotees are sometimes enthusiastic about fruitive activities and are habituated to philosophical speculation. The pure devotees are free from all these mixtures and are completely absorbed in the service of the Lord, regardless of how and where they are situated. Pure devotees of the Lord are not enthusiastic to put aside their service to the Lord in order to go visit holy places of pilgrimage. A great devotee of the Lord in modern times, Śrī Narottama dāsa Ṭhākura, has sung like this: "To visit holy places of pilgrimage is another bewilderment of the mind because devotional service to the Lord at any place is the last word in spiritual perfection."
(Srimad Bhagavatam----3:3:26---purport).

When a living entity desires to serve the Lord in transcendental loving service, the Lord helps the devotee in so many ways as the caitya-guru, or the spiritual master within, and thus the devotee can perform many wonderful activities beyond material estimation. By the mercy of the Lord even a layman can compose prayers of the highest spiritual perfection. Such spiritual perfection is not limited by material qualifications but is developed by dint of one's sincere endeavor to render transcendental service. Voluntary endeavor is the only qualification for spiritual perfection. Material acquisitions of wealth or education are not considered.
(Srimad Bhagavatam----3:9:38---purport).

If a woman is fortunate enough to be the wife of a pure devotee, she can serve her husband without any desire for sense gratification. If she remains engaged in the service of her exalted husband, she will automatically attain the spiritual perfections of her husband.
(Srimad Bhagavatam----4:28:43---purport).