Without being fearless, one cannot be joyful

From the Purport to SB 4.24.52

In Bhagavad-gītā it is said that in order to make spiritual progress, one must become fearless. Abhayaṁ sattva-saṁśuddhiḥ (Bg. 16.1). Fearfulness is the result of material involvement. It is also said in Śrīmad-Bhāgavatam(11.2.37), bhayaṁ dvitīyābhiniveśataḥ syāt: fearfulness is a creation of the bodily conception of life. As long as one is absorbed in the thought that he is this material body, he is fearful, and as soon as one is freed from this material conception, he becomes brahma-bhūta, or self-realized, and immediately becomes fearless. Brahma-bhūtaḥ prasannātmā (Bg. 18.54). Without being fearless, one cannot be joyful. The bhaktas, the devotees, are fearless and always joyful because they are constantly engaged in the service of the lotus feet of the Lord. It is also said:

evaṁ prasanna-manaso
 bhagavad-bhakti-yogataḥ
bhagavat-tattva-vijñānaṁ
 mukta-saṅgasya jāyate

(Bhāg. 1.2.20)

By practicing bhagavad-bhakti-yoga, one becomes fearless and joyful. Unless one becomes fearless and joyful, he cannot understand the science of God. Bhagavat-tattva-vijñānaṁ mukta-saṅgasya jāyate. This verse refers to those who are completely liberated from the fearfulness of this material world. When one is so liberated, he can really understand the transcendental features of the form of the Lord. Lord Śiva therefore advises everyone to practicebhagavad-bhakti-yoga. As will be clear in the following verses, by doing so one can become really liberated and enjoy spiritual bliss.

It is also stated:

om ajñāna-timirāndhasya
 jñānāñjana-śalākayā
cakṣur unmīlitaṁ yena
 tasmai śrī-gurave namaḥ

The Lord is the supreme spiritual master, and the bona fide representative of the Supreme Lord is also a spiritual master. The Lord from within enlightens the devotees by the effulgence of the nails of His lotus feet, and His representative, the spiritual master, enlightens from without. Only by thinking of the lotus feet of the Lord and always taking the spiritual master’s advice can one advance in spiritual life and understand Vedic knowledge:

yasya deve parā bhaktir
 yathā deve tathā gurau
tasyaite kathitā hy arthāḥ
 prakāśante mahātmanaḥ

Thus the Vedas (Śvetāśvatara Upaniṣad 6.23) enjoin that for one who has unflinching faith in the lotus feet of the Lord, as well as in the spiritual master, the real import of Vedic knowledge can be revealed.

Material Happiness comes of its own accord- do not waste time seeking it

I was reading today from SB 11th canto and found this very nice verse spoken by the Avadhuta Brahmin to Maharaj Yadu.It says an intelligent person does not waste time trying to go after material happiness because it comes on its own just like distress. He instead reserves a major protion of life in serving Lord Sri Krsna and His devotees.
By pleasing the Supreme Lord one can attain permanent happiness.

Quoting the verse below and other related verses from SB explaining the same concept:

Maharaj Yadu once observed a certain brahmana avadhuta who appeared to be quite young and learned, wandering about fearlessly. Being himself most learned in spiritual science, the King took the opportunity and inquired from him about why he was wanering about like that and what was the cause of his ecstacy.The avadhuta brahmin spoke at length with Maharaj Yadu and shared the secrets for being how he was an how he has taken inspiration from the 24 Gurus. while thus speaking the avadhuta also spoke the following verse:

SB 11.8.1: The saintly brāhmaṇa said: O King, the embodied living entity automatically experiences unhappiness in heaven or hell. Similarly, happiness will also be experienced, even without one's seeking it. Therefore a person of intelligent discrimination does not make any endeavor to obtain such material happiness.

Narada Muni explains the same thing to Srila Vyasadeva while inspiring him to write Srimad Bhagavatam

SB 1.5.18: Persons who are actually intelligent and philosophically inclined should endeavor only for that purposeful end which is not obtainable even by wandering from the topmost planet [Brahmaloka] down to the lowest planet [Pātāla]. As far as happiness derived from sense enjoyment is concerned, it can be obtained automatically in course of time, just as in course of time we obtain miseries even though we do not desire them.

Also Prahlada Maharaj says the same to his school mates in the Seventh Canto:
SB 7.6.3: Prahlāda Mahārāja continued: My dear friends born of demoniac families, the happiness perceived with reference to the sense objects by contact with the body can be obtained in any form of life, according to one's past fruitive activities. Such happiness is automatically obtained without endeavor, just as we obtain distress.

The purport to SB 11.8.1 quoted above explains the concept very nicely:
PURPORT
One should not uselessly waste his life pursuing material sense gratification, because a specific quantity of material happiness will automatically come to one as a result of one's past and present fruitive activities. This lesson is learned from the ajagara, or python, who lies down and accepts for his maintenance whatever comes of its own accord. Remarkably, in both material heaven and hell happiness and unhappiness come automatically, due to our previous activities, although the proportions of happiness and unhappiness certainly vary. Either in heaven or in hell one may eat, drink, sleep and have sex life, but these activities, being based on the material body, are temporary and inconsequential. An intelligent person should see that even the best material situation is actually a punishment for previous unlawful activities executed outside the scope of loving devotional service to God. A conditioned soul undergoes great trouble to obtain a little happiness. After struggling in material life, which is full of hardship and hypocrisy, one may receive a little sense gratification, but this illusory pleasure in no way offsets the burden of suffering one must bear to obtain it. After all, a pretty hat is no cure for a homely face. If one really wants to solve life's problems, one should live simply and reserve the major portion of one's life for loving service to Kṛṣṇa. Even those who do not serve God receive a certain standard of maintenance from Him; therefore we can just imagine the security the Lord affords to those who dedicate their lives to His devotional service.
Unrefined fruitive workers foolishly worry only about the present life, whereas more pious karmīs imprudently make elaborate arrangements for future material sense gratification, unaware that all such enjoyment is temporary. The real solution, however, is to understand that by pleasing the Personality of Godhead, who is the master of all senses and all desires, one can attain permanent happiness. Such knowledge easily solves the problems of life.