The Bṛhan-nāradīya Purāṇa recommends:
harer nāma harer nāma harer nāmaiva kevalam
kalau nāsty eva nāsty eva nāsty eva gatir anyathā
(CC-1:17:21)
"For spiritual progress in this Age of Kali, there is no alternative, no alternative, no alternative to the holy name, the holy name, the holy name of the Lord."
(Sri Caitanya Caritamrta----1:17:212---purport).

When a devotee revives his loving service to the Supreme Personality of Godhead, it should be understood that he has been successful in achieving the desired goal of his life. At that time everything is automatically done by the mercy of the holy name, and the devotee automatically advances in his spiritual progress.
(Sri Caitanya Caritamrta----1:7:84---purport).

A gṛhastha is not meant to enjoy sex life without restriction. Indeed, the whole purpose of Vedic life is to become free from sexual indulgence. All the āśramas are recognized for spiritual progress, and therefore although the gṛhastha-āśrama gives a kind of license for sex life for a certain time, it does not allow unrestricted sex life.
(Srimad Bhagavatam----7:12---summary).

We are not the body; we are spiritual beings trapped in the body. Our real interest lies in understanding this simple fact. Then we can make further spiritual progress. Otherwise, if we remain in the bodily conception of life, our miserable material existence will continue forever.
(Srimad Bhagavatam----6:15:3---purport).

And self-control means that one should not accept anything which is detrimental to the path of spiritual progress. One should become accustomed to this and reject anything which is against the path of spiritual progress. This is real renunciation.
(Bhagavad-Gita----13:8-12---purport).

Lord Nṛsiṁhadeva wanted to bestow benedictions upon Prahlāda Mahārāja, one after another, but Prahlāda Mahārāja, thinking them impediments on the path ofspiritual progress, did not accept any of them. Instead, he fully surrendered at the Lord's lotus feet.
(Srimad Bhagavatam----7:10---purport).

Eating is not prohibited, but if we eat voraciously we shall certainly sleep more than required. Sense gratification ensues, and we may be degraded to a lower life form. In that way our spiritual progress may be checked at least for the time being.
(Srimad Bhagavatam----5:8:29---purport).

We have seen that in spite of the very black record of their past lives, persons who take to Kṛṣṇa consciousness become perfectly cleansed of all dirty things and make spiritual progress very swiftly.
(Srimad Bhagavatam----4:21:31---purport).